user: You are a structured reasoning expert tasked with solving problems step by step. 
You first think about the reasoning process in the mind and then provide the answer. The reasoning process and answer should be enclosed within <think> </think> and <answer> </answer> tags, respectively, i.e., <think> reasoning process here </think> <answer> answer here </answer>. 
Given a question and the associated knowledge graph triplets (entity, relation, entity), you are asked to answer the question with these triplets and your own knowledge. 
You can break down the original question into several sub-questions and explore the given knowledge graph to solve them step-by-step. If there are multiple possible answers, choose one as the final answer. 
After thinking, when you finally reach a conclusion, clearly state the answer within <answer> </answer> tags, i.e., <answer> answer here </answer>. 
Question: an electric field strength units of volt per metre has what unit of area measurement system? 
Knowledge Triplets: Newton metre, measurement_unit.force_moment_unit.measurement_system, International System of Units
International System of Units, measurement_unit.measurement_system.amount_concentration_units, Mole per cubic metre
Milliwatt, measurement_unit.power_unit.measurement_system, International System of Units
Estelle, base.yupgrade.user.topics, International System of Units
Kilojoule, measurement_unit.energy_unit.measurement_system, International System of Units
zettasecond, measurement_unit.time_unit.measurement_system, International System of Units
International System of Units, measurement_unit.measurement_system.time_units, zettasecond
International System of Units, measurement_unit.measurement_system.time_units, Nanosecond
Weber, measurement_unit.magnetic_flux_unit.measurement_system, International System of Units
International System of Units, measurement_unit.measurement_system.heat_capacity_units, Joule per kelvin
m.014_, type.permission.controls, Strength in volts per meter
International System of Units, measurement_unit.measurement_system.volume_units, Centiliter
International System of Units, measurement_unit.measurement_system.resistivity_units, Ohm centimeter
Joule per cubic metre per kelvin, measurement_unit.volumetric_heat_capacity_unit.measurement_system, International System of Units
International System of Units, measurement_unit.measurement_system.specific_heat_capacity_units, Joule per kilogram per kelvin
Newton per metre, measurement_unit.surface_tension_unit.measurement_system, International System of Units
Kilopascal, measurement_unit.pressure_unit.measurement_system, International System of Units
Joule per gram, measurement_unit.specific_energy_unit.measurement_system, International System of Units
Volt per metre, measurement_unit.electric_field_strength_unit.strength_in_volts_per_meter, 1.0
International System of Units, measurement_unit.measurement_system.inverse_temperature_units, micro per degree C
International System of Units, measurement_unit.measurement_system.frequency_units, Kilohertz
Milligram, measurement_unit.mass_unit.measurement_system, International System of Units
International System of Units, measurement_unit.measurement_system.amount_concentration_units, Micromolar
Megapascal, measurement_unit.pressure_unit.measurement_system, International System of Units
bit per second, measurement_unit.unit_of_data_transmission_rate.measurement_system, International System of Units
Centisecond, measurement_unit.time_unit.measurement_system, International System of Units
International System of Units, measurement_unit.measurement_system.time_units, Microsecond
International System of Units, measurement_unit.measurement_system.volumetric_heat_capacity_units, Joule per cubic metre per kelvin
International System of Units, measurement_unit.measurement_system.force_units, Newton
Watt per square metre, measurement_unit.irradiance_unit.measurement_system, International System of Units
International System of Units, measurement_unit.measurement_system.time_units, hectosecond
International System of Units, measurement_unit.measurement_system.pressure_units, Megapascal
Microgram, measurement_unit.mass_unit.measurement_system, International System of Units
International System of Units, measurement_unit.measurement_system.length_units, Hectometre
International System of Units, measurement_unit.measurement_system.energy_units, Kilojoule
International System of Units, measurement_unit.measurement_system.time_units, Megasecond
Femtosecond, measurement_unit.time_unit.measurement_system, International System of Units
International System of Units, measurement_unit.measurement_system.density_units, Kilogram per cubic metre
International System of Units, measurement_unit.measurement_system.luminous_intensity_units, Candela
Nanometre, measurement_unit.distance_unit.measurement_system, International System of Units
International System of Units, measurement_unit.measurement_system.absorbed_dose_units, Gray
Coulomb per square metre, measurement_unit.electric_flux_density_unit.measurement_system, International System of Units
Joule, measurement_unit.energy_unit.measurement_system, International System of Units
International System of Units, measurement_unit.measurement_system.current_units, Ampere
International System of Units, measurement_unit.measurement_system.molar_energy_units, Joule per mole
Decimetre, measurement_unit.distance_unit.measurement_system, International System of Units
Cubic metre per kilogram, measurement_unit.specific_volume_unit.measurement_system, International System of Units
International System of Units, measurement_unit.measurement_system.illuminance_units, Lux
Deciliter, measurement_unit.volume_unit.measurement_system, International System of Units
International System of Units, measurement_unit.measurement_system.specific_volume_units, Cubic metre per kilogram
International System of Units, measurement_unit.measurement_system.radiance_units, Watt per square metre per steradian
Candela, measurement_unit.luminous_intensity_unit.measurement_system, International System of Units
International System of Units, measurement_unit.measurement_system.volume_units, Milliliter
International System of Units, measurement_unit.measurement_system.inductance_units, Henry
International System of Units, measurement_unit.measurement_system.volumetric_flow_rate_units, Cubic metre per second
terasecond, measurement_unit.time_unit.measurement_system, International System of Units
International System of Units, measurement_unit.measurement_system.weight_units, Milligram
Centiliter, measurement_unit.volume_unit.measurement_system, International System of Units
Coulomb, measurement_unit.charge_unit.measurement_system, International System of Units
International System of Units, measurement_unit.measurement_system.length_units, Meter
Watt per meter per kelvin, measurement_unit.thermal_conductivity_unit.measurement_system, International System of Units
Candela per square metre, measurement_unit.luminance_unit.measurement_system, International System of Units
International System of Units, measurement_unit.measurement_system.time_units, yoctosecond
International System of Units, measurement_unit.measurement_system.time_units, exasecond
Strength in volts per meter, type.property.schema, Unit of Electric Field Strength
International System of Units, measurement_unit.measurement_system.frequency_units, Gigahertz
Gigahertz, measurement_unit.unit_of_frequency.measurement_system, International System of Units
International System of Units, measurement_unit.measurement_system.electric_charge_density_units, Coulomb per cubic metre
Kilowatt, measurement_unit.power_unit.measurement_system, International System of Units
International System of Units, measurement_unit.measurement_system.force_moment_units, Newton metre
International System of Units, measurement_unit.measurement_system.time_units, Millisecond
International System of Units, measurement_unit.measurement_system.weight_units, Tonne
Electric field strength, measurement_unit.dimension.units, Volt per metre
International System of Units, measurement_unit.measurement_system.pressure_units, Kilopascal
Farad, measurement_unit.capacitance_unit.measurement_system, International System of Units
Gigapascal, measurement_unit.pressure_unit.measurement_system, International System of Units
International System of Units, measurement_unit.measurement_system.time_units, decasecond
International System of Units, measurement_unit.measurement_system.magnetic_flux_density_units, Tesla
Picometre, measurement_unit.distance_unit.measurement_system, International System of Units
Centimeter, measurement_unit.distance_unit.measurement_system, International System of Units
Attosecond, measurement_unit.time_unit.measurement_system, International System of Units
International System of Units, measurement_unit.measurement_system.length_units, Nanometre
yoctosecond, measurement_unit.time_unit.measurement_system, International System of Units
International System of Units, measurement_unit.measurement_system.time_units, terasecond
petasecond, measurement_unit.time_unit.measurement_system, International System of Units
International System of Units, measurement_unit.measurement_system.angle_units, Radian
International System of Units, base.schemastaging.context_name.pronunciation, g.125_p8yyr
International System of Units, measurement_unit.measurement_system.permeability_units, Henry per metre
Decametre, measurement_unit.distance_unit.measurement_system, International System of Units
Second, measurement_unit.time_unit.measurement_system, International System of Units
International System of Units, measurement_unit.measurement_system.pressure_units, Pascal
International System of Units, measurement_unit.measurement_system.power_units, Megawatt
Joule per gram per kelvin, measurement_unit.specific_heat_capacity_unit.measurement_system, International System of Units
Watt, measurement_unit.power_unit.measurement_system, International System of Units
International System of Units, measurement_unit.measurement_system.length_units, Kilometer
Steradian, measurement_unit.solid_angle_unit.measurement_system, International System of Units
International System of Units, measurement_unit.measurement_system.time_units, Picosecond
International System of Units, measurement_unit.measurement_system.thermal_conductivity_units, Watt per meter per kelvin
International System of Units, measurement_unit.measurement_system.time_units, Attosecond
International System of Units, measurement_unit.measurement_system.viscosity_units, Pascal second
International System of Units, measurement_unit.measurement_system.resistance_units, Ohm
Meter, measurement_unit.distance_unit.measurement_system, International System of Units
Henry per metre, measurement_unit.permeability_unit.measurement_system, International System of Units
Lux, measurement_unit.illuminance_unit.measurement_system, International System of Units
International System of Units, measurement_unit.measurement_system.frequency_units, Megahertz
Newton, measurement_unit.unit_of_force.measurement_system, International System of Units
Electric field strength, measurement_unit.dimension.units, Newtons per coulomb
International System of Units, measurement_unit.measurement_system.molar_energy_units, Kilojoule per mole
International System of Units, measurement_unit.measurement_system.surface_density_units, Kilogram per square metre
International System of Units, measurement_unit.measurement_system.amount_concentration_units, Nanomolar
International System of Units, measurement_unit.measurement_system.wavenumber_units, Reciprocal metre
Siemens, measurement_unit.conductance_unit.measurement_system, International System of Units
Nanosecond, measurement_unit.time_unit.measurement_system, International System of Units
Ohm meter, measurement_unit.unit_of_resistivity.measurement_system, International System of Units
Reciprocal metre, measurement_unit.wavenumber_unit.measurement_system, International System of Units
Gray per second, measurement_unit.absorbed_dose_rate_unit.measurement_system, International System of Units
Kilogram, measurement_unit.mass_unit.measurement_system, International System of Units
International System of Units, measurement_unit.measurement_system.permittivity_units, Farad per metre
decasecond, measurement_unit.time_unit.measurement_system, International System of Units
Megasecond, measurement_unit.time_unit.measurement_system, International System of Units
International System of Units, measurement_unit.measurement_system.length_units, Picometre
Tonne, measurement_unit.mass_unit.measurement_system, International System of Units
Millisiemens, measurement_unit.conductance_unit.measurement_system, International System of Units
International System of Units, measurement_unit.measurement_system.time_units, Femtosecond
International System of Units, measurement_unit.measurement_system.data_rate_units, Gigabit per second
International System of Units, measurement_unit.measurement_system.inverse_temperature_units, Inverse Kelvin
International System of Units, measurement_unit.measurement_system.length_units, Decimetre
International System of Units, measurement_unit.measurement_system.potential_units, Volt
Kilobit per second, measurement_unit.unit_of_data_transmission_rate.measurement_system, International System of Units
Picosecond, measurement_unit.time_unit.measurement_system, International System of Units
International System of Units, measurement_unit.measurement_system.speed_units, Kilometres per hour
Becquerel, measurement_unit.radioactivity_unit.measurement_system, International System of Units
Joule per kilogram, measurement_unit.specific_energy_unit.measurement_system, International System of Units
International System of Units, measurement_unit.measurement_system.dose_equivalence_units, Sievert
Joule per mole per kelvin, measurement_unit.molar_heat_capacity_unit.measurement_system, International System of Units
International System of Units, measurement_unit.measurement_system.energy_units, Joule
Ampere per metre, measurement_unit.magnetic_field_strength_unit.measurement_system, International System of Units
Farad per metre, measurement_unit.permittivity_unit.measurement_system, International System of Units
International System of Units, measurement_unit.measurement_system.catalytic_activity_units, Katal
Watt per steradian, measurement_unit.radiant_intensity_unit.measurement_system, International System of Units
Cubic kilometer, measurement_unit.volume_unit.measurement_system, International System of Units
Kilogram per cubic metre, measurement_unit.unit_of_density.measurement_system, International System of Units
Square kilometer, measurement_unit.area_unit.measurement_system, International System of Units
Hectoliter, measurement_unit.volume_unit.measurement_system, International System of Units
Kilosecond, measurement_unit.time_unit.measurement_system, International System of Units
Gigasecond, measurement_unit.time_unit.measurement_system, International System of Units
International System of Units, measurement_unit.measurement_system.absorbed_dose_rate_units, Gray per second
Microsiemens per centimeter, measurement_unit.unit_of_conductivity.measurement_system, International System of Units
International System of Units, measurement_unit.measurement_system.time_units, Kilosecond
International System of Units, measurement_unit.measurement_system.radioactivity_units, Becquerel
Watt per square metre per steradian, measurement_unit.radiance_unit.measurement_system, International System of Units
International System of Units, measurement_unit.measurement_system.time_units, Gigasecond
Tesla, measurement_unit.magnetic_flux_density_unit.measurement_system, International System of Units
International System of Units, measurement_unit.measurement_system.acceleration_units, Metre per second squared
Millimeter, measurement_unit.distance_unit.measurement_system, International System of Units
International System of Units, measurement_unit.measurement_system.temperature_units, Kelvin
International System of Units, measurement_unit.measurement_system.frequency_units, Hertz
Joule per kelvin, measurement_unit.heat_capacity_unit.measurement_system, International System of Units
Coulomb per cubic metre, measurement_unit.electric_charge_density_unit.measurement_system, International System of Units
International System of Units, measurement_unit.measurement_system.capacitance_units, Farad
International System of Units, measurement_unit.measurement_system.speed_units, Metre per second
Liter, measurement_unit.volume_unit.measurement_system, International System of Units
Volt, measurement_unit.potential_unit.measurement_system, International System of Units
m.0qrbg_1, dataworld.gardening_hint.last_referenced_by, International System of Units
International System of Units, measurement_unit.measurement_system.angular_velocity_units, Radian per second
Kilogram per square metre, measurement_unit.unit_of_surface_density.measurement_system, International System of Units
Ohm centimeter, measurement_unit.unit_of_resistivity.measurement_system, International System of Units
Siemens per meter, measurement_unit.unit_of_conductivity.measurement_system, International System of Units
International System of Units, measurement_unit.measurement_system.exposure_units, Coulomb per kilogram
International System of Units, measurement_unit.measurement_system.weight_units, Microgram
International System of Units, measurement_unit.measurement_system.specific_energy_units, Joule per kilogram
Square meter, measurement_unit.area_unit.measurement_system, International System of Units
Ampere, measurement_unit.current_unit.measurement_system, International System of Units
Gram, measurement_unit.mass_unit.measurement_system, International System of Units
Megabit per second, measurement_unit.unit_of_data_transmission_rate.measurement_system, International System of Units
Millisecond, measurement_unit.time_unit.measurement_system, International System of Units
International System of Units, measurement_unit.measurement_system.area_units, Square kilometer
Joule per kilogram per kelvin, measurement_unit.specific_heat_capacity_unit.measurement_system, International System of Units
International System of Units, measurement_unit.measurement_system.length_units, Decametre
Kelvin, measurement_unit.temperature_unit.measurement_system, International System of Units
International System of Units, measurement_unit.measurement_system.length_units, Micrometer
hectosecond, measurement_unit.time_unit.measurement_system, International System of Units
Strength in volts per meter, type.property.unique, true
Radian, measurement_unit.angle_unit.measurement_system, International System of Units
International System of Units, measurement_unit.measurement_system.solid_angle_units, Steradian
Nanomolar, measurement_unit.amount_concentration_unit.measurement_system, International System of Units
Strength in volts per meter, type.object.permission, m.014_
International System of Units, measurement_unit.measurement_system.luminous_flux_units, Lumen
International System of Units, measurement_unit.measurement_system.time_units, petasecond
micro per degree C, measurement_unit.inverse_temperature_unit.measurement_system, International System of Units
International System of Units, measurement_unit.measurement_system.specific_energy_units, Joule per gram
Cubic metre per second, measurement_unit.unit_of_volumetric_flow_rate.measurement_system, International System of Units
International System of Units, measurement_unit.measurement_system.time_units, yottasecond
Gray, measurement_unit.absorbed_dose_unit.measurement_system, International System of Units
Megawatt, measurement_unit.power_unit.measurement_system, International System of Units
International System of Units, measurement_unit.measurement_system.substance_units, Mole
Metre per second squared, measurement_unit.acceleration_unit.measurement_system, International System of Units
International System of Units, measurement_unit.measurement_system.power_units, Kilowatt
Megametre, measurement_unit.distance_unit.measurement_system, International System of Units
International System of Units, measurement_unit.measurement_system.length_units, Millimeter
International System of Units, measurement_unit.measurement_system.area_units, Square meter
zeptosecond, measurement_unit.time_unit.measurement_system, International System of Units
International System of Units, measurement_unit.measurement_system.data_rate_units, bit per second
Milliliter, measurement_unit.volume_unit.measurement_system, International System of Units
International System of Units, measurement_unit.measurement_system.magnetic_flux_units, Weber
Lumen, measurement_unit.luminous_flux_unit.measurement_system, International System of Units
International System of Units, measurement_unit.measurement_system.conductance_units, Millisiemens
International System of Units, user.avh.default_domain.ellerdale_topic.ellerdale_id, 0080-5e5f
decisecond, measurement_unit.time_unit.measurement_system, International System of Units
Inverse Kelvin, measurement_unit.inverse_temperature_unit.measurement_system, International System of Units
International System of Units, measurement_unit.measurement_system.resistivity_units, Ohm meter
International System of Units, measurement_unit.measurement_system.speed_units, Kilometres per second
International System of Units, measurement_unit.measurement_system.volume_units, Hectoliter
Joule per mole, measurement_unit.molar_energy_unit.measurement_system, International System of Units
International System of Units, measurement_unit.measurement_system.radiant_intensity_units, Watt per steradian
International System of Units, measurement_unit.measurement_system.amount_concentration_units, Molar
International System of Units, measurement_unit.measurement_system.weight_units, Kilogram
International System of Units, measurement_unit.measurement_system.volume_units, Deciliter
International System of Units, measurement_unit.measurement_system.time_units, Centisecond
International System of Units, measurement_unit.measurement_system.weight_units, Gram
International System of Units, measurement_unit.measurement_system.charge_units, Coulomb
Kilometer, measurement_unit.distance_unit.measurement_system, International System of Units
yottasecond, measurement_unit.time_unit.measurement_system, International System of Units
Pascal second, measurement_unit.viscosity_unit.measurement_system, International System of Units
Molar, measurement_unit.amount_concentration_unit.measurement_system, International System of Units
Strength in volts per meter, type.property.unit, Volt per metre
International System of Units, measurement_unit.measurement_system.temperature_units, Degree Celsius
Microsiemens, measurement_unit.conductance_unit.measurement_system, International System of Units
International System of Units, measurement_unit.measurement_system.volume_units, Cubic kilometer
Gigabit per second, measurement_unit.unit_of_data_transmission_rate.measurement_system, International System of Units
International System of Units, measurement_unit.measurement_system.molar_heat_capacity_units, Joule per mole per kelvin
International System of Units, measurement_unit.measurement_system.magnetic_field_strength_units, Ampere per metre
Radian per second, measurement_unit.angular_velocity_unit.measurement_system, International System of Units
Sievert, measurement_unit.dose_equivalence_unit.measurement_system, International System of Units
Degree Celsius, measurement_unit.temperature_unit.measurement_system, International System of Units
Ampere per square metre, measurement_unit.current_density_unit.measurement_system, International System of Units
International System of Units, measurement_unit.measurement_system.pressure_units, Gigapascal
Unit of Electric Field Strength, type.type.properties, Strength in volts per meter
Coulomb per kilogram, measurement_unit.exposure_unit.measurement_system, International System of Units
Katal, measurement_unit.catalytic_activity_unit.measurement_system, International System of Units
International System of Units, measurement_unit.measurement_system.data_rate_units, Terabit per second
International System of Units, measurement_unit.measurement_system.conductance_units, Microsiemens
International System of Units, measurement_unit.measurement_system.data_rate_units, Megabit per second
International System of Units, measurement_unit.measurement_system.time_units, Second
International System of Units, measurement_unit.measurement_system.length_units, Megametre
International System of Units, measurement_unit.measurement_system.power_units, Milliwatt
Metre per second, measurement_unit.speed_unit.measurement_system, International System of Units
Micromolar, measurement_unit.amount_concentration_unit.measurement_system, International System of Units
Kilometres per second, measurement_unit.speed_unit.measurement_system, International System of Units
International System of Units, measurement_unit.measurement_system.data_rate_units, Kilobit per second
Joule per cubic metre, measurement_unit.energy_density_unit.measurement_system, International System of Units
International System of Units, measurement_unit.measurement_system.luminance_units, Candela per square metre
Microsecond, measurement_unit.time_unit.measurement_system, International System of Units
International System of Units, measurement_unit.measurement_system.volume_units, Liter
International System of Units, measurement_unit.measurement_system.length_units, Centimeter
Kilohertz, measurement_unit.unit_of_frequency.measurement_system, International System of Units
Katal per cubic metre, measurement_unit.catalytic_concentration_unit.measurement_system, International System of Units
International System of Units, measurement_unit.measurement_system.electric_field_strength_units, Volt per metre
International System of Units, measurement_unit.measurement_system.specific_heat_capacity_units, Joule per gram per kelvin
Terabit per second, measurement_unit.unit_of_data_transmission_rate.measurement_system, International System of Units
Strength in volts per meter, type.property.expected_type, Floating Point Number
exasecond, measurement_unit.time_unit.measurement_system, International System of Units
International System of Units, measurement_unit.measurement_system.power_units, Watt
Floating Point Number, type.type.expected_by, Strength in volts per meter
Kilojoule per mole, measurement_unit.molar_energy_unit.measurement_system, International System of Units
International System of Units, measurement_unit.measurement_system.conductance_units, Siemens
Ohm, measurement_unit.resistance_unit.measurement_system, International System of Units
Henry, measurement_unit.inductance_unit.measurement_system, International System of Units
Mole per cubic metre, measurement_unit.amount_concentration_unit.measurement_system, International System of Units
Cubic metre, measurement_unit.volume_unit.measurement_system, International System of Units
Pascal, measurement_unit.pressure_unit.measurement_system, International System of Units
Radian per second squared, measurement_unit.angular_acceleration_unit.measurement_system, International System of Units
Cubic metre per mole, measurement_unit.molar_volume_unit.measurement_system, International System of Units
Volt per metre, measurement_unit.electric_field_strength_unit.measurement_system, International System of Units
International System of Units, measurement_unit.measurement_system.irradiance_units, Watt per square metre
International System of Units, measurement_unit.measurement_system.time_units, zeptosecond
International System of Units, measurement_unit.measurement_system.catalytic_concentration_units, Katal per cubic metre
International System of Units, measurement_unit.measurement_system.volume_units, Cubic metre
Kilometres per hour, measurement_unit.speed_unit.measurement_system, International System of Units
Mole, measurement_unit.substance_unit.measurement_system, International System of Units
International System of Units, measurement_unit.measurement_system.electric_flux_density_units, Coulomb per square metre
Hertz, measurement_unit.unit_of_frequency.measurement_system, International System of Units
Hectometre, measurement_unit.distance_unit.measurement_system, International System of Units
International System of Units, measurement_unit.measurement_system.current_density_units, Ampere per square metre
International System of Units, measurement_unit.measurement_system.energy_density_units, Joule per cubic metre
Micrometer, measurement_unit.distance_unit.measurement_system, International System of Units
International System of Units, measurement_unit.measurement_system.surface_tension_units, Newton per metre
International System of Units, measurement_unit.measurement_system.molar_volume_units, Cubic metre per mole
International System of Units, measurement_unit.measurement_system.angular_acceleration_units, Radian per second squared
International System of Units, measurement_unit.measurement_system.time_units, decisecond
Electric field strength, measurement_unit.dimension.si_base_unit, Volt per metre
Megahertz, measurement_unit.unit_of_frequency.measurement_system, International System of Units

Answer: Square kilometer
Square meter