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: international system of units uses which unit of energy? 
Knowledge Triplets: Lumen, measurement_unit.luminous_flux_unit.measurement_system, International System of Units
Hertz, measurement_unit.unit_of_frequency.measurement_system, International System of Units
International System of Units, measurement_unit.measurement_system.temperature_units, Degree Celsius
Nanosecond, measurement_unit.time_unit.measurement_system, International System of Units
Radian per second squared, measurement_unit.angular_acceleration_unit.measurement_system, International System of Units
exasecond, measurement_unit.time_unit.measurement_system, International System of Units
Kilojoule per mole, measurement_unit.molar_energy_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.conductance_units, Siemens
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.volume_units, Centiliter
Gigahertz, measurement_unit.unit_of_frequency.measurement_system, International System of Units
Coulomb per cubic metre, measurement_unit.electric_charge_density_unit.measurement_system, International System of Units
Volt per metre, measurement_unit.electric_field_strength_unit.measurement_system, International System of Units
Henry, measurement_unit.inductance_unit.measurement_system, International System of Units
International System of Units, measurement_unit.measurement_system.time_units, Kilosecond
Watt per meter per kelvin, measurement_unit.thermal_conductivity_unit.measurement_system, International System of Units
Joule per mole, measurement_unit.molar_energy_unit.measurement_system, International System of Units
International System of Units, measurement_unit.measurement_system.capacitance_units, Farad
decisecond, measurement_unit.time_unit.measurement_system, International System of Units
International System of Units, measurement_unit.measurement_system.weight_units, Tonne
International System of Units, measurement_unit.measurement_system.molar_energy_units, Kilojoule per mole
International System of Units, measurement_unit.measurement_system.length_units, Decametre
Gray per second, measurement_unit.absorbed_dose_rate_unit.measurement_system, International System of Units
Volt, measurement_unit.potential_unit.measurement_system, International System of Units
International System of Units, measurement_unit.measurement_system.frequency_units, Kilohertz
International System of Units, measurement_unit.measurement_system.inverse_temperature_units, micro per degree C
Katal, measurement_unit.catalytic_activity_unit.measurement_system, International System of Units
International System of Units, measurement_unit.measurement_system.pressure_units, Megapascal
International System of Units, measurement_unit.measurement_system.data_rate_units, Megabit per second
Millisecond, measurement_unit.time_unit.measurement_system, International System of Units
International System of Units, measurement_unit.measurement_system.absorbed_dose_units, Gray
Centisecond, measurement_unit.time_unit.measurement_system, International System of Units
Kelvin, measurement_unit.temperature_unit.measurement_system, International System of Units
International System of Units, measurement_unit.measurement_system.magnetic_field_strength_units, Ampere per metre
yottasecond, measurement_unit.time_unit.measurement_system, International System of Units
International System of Units, measurement_unit.measurement_system.force_moment_units, Newton metre
decasecond, measurement_unit.time_unit.measurement_system, International System of Units
Micrometer, measurement_unit.distance_unit.measurement_system, International System of Units
International System of Units, measurement_unit.measurement_system.volume_units, Deciliter
Centimeter, measurement_unit.distance_unit.measurement_system, International System of Units
International System of Units, measurement_unit.measurement_system.length_units, Picometre
Siemens, measurement_unit.conductance_unit.measurement_system, International System of Units
Kilogram per cubic metre, measurement_unit.unit_of_density.measurement_system, International System of Units
International System of Units, measurement_unit.measurement_system.amount_concentration_units, Molar
International System of Units, measurement_unit.measurement_system.time_units, decasecond
International System of Units, measurement_unit.measurement_system.amount_concentration_units, Mole per cubic metre
Cubic metre per second, measurement_unit.unit_of_volumetric_flow_rate.measurement_system, International System of Units
Picometre, measurement_unit.distance_unit.measurement_system, International System of Units
International System of Units, measurement_unit.measurement_system.length_units, Centimeter
International System of Units, measurement_unit.measurement_system.energy_units, Joule
Centiliter, measurement_unit.volume_unit.measurement_system, International System of Units
Farad, measurement_unit.capacitance_unit.measurement_system, International System of Units
International System of Units, measurement_unit.measurement_system.volumetric_heat_capacity_units, Joule per cubic metre per kelvin
Coulomb, measurement_unit.charge_unit.measurement_system, International System of Units
Gigasecond, measurement_unit.time_unit.measurement_system, International System of Units
Candela per square metre, measurement_unit.luminance_unit.measurement_system, International System of Units
Watt per steradian, measurement_unit.radiant_intensity_unit.measurement_system, International System of Units
International System of Units, measurement_unit.measurement_system.luminance_units, Candela per square metre
micro per degree C, measurement_unit.inverse_temperature_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.inductance_units, Henry
Metric system, user.movgp0.default_domain.measurement_system.unit_of_energy, Joule
International System of Units, measurement_unit.measurement_system.catalytic_activity_units, Katal
Liter, measurement_unit.volume_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.dose_equivalence_units, Sievert
International System of Units, measurement_unit.measurement_system.time_units, Centisecond
International System of Units, measurement_unit.measurement_system.radiance_units, Watt per square metre per steradian
Coulomb per square metre, measurement_unit.electric_flux_density_unit.measurement_system, International System of Units
International System of Units, measurement_unit.measurement_system.data_rate_units, Gigabit per second
Joule per mole, measurement_unit.molar_energy_unit.energy_in_joules_per_mole, 1.0
International System of Units, measurement_unit.measurement_system.length_units, Hectometre
Gigapascal, measurement_unit.pressure_unit.measurement_system, International System of Units
International System of Units, measurement_unit.measurement_system.time_units, terasecond
International System of Units, measurement_unit.measurement_system.weight_units, Microgram
Joule per gram, measurement_unit.specific_energy_unit.energy_in_joules_per_kilogram, 0.001
Megametre, measurement_unit.distance_unit.measurement_system, International System of Units
Inverse Kelvin, measurement_unit.inverse_temperature_unit.measurement_system, International System of Units
Steradian, measurement_unit.solid_angle_unit.measurement_system, International System of Units
Kilobit per second, measurement_unit.unit_of_data_transmission_rate.measurement_system, International System of Units
International System of Units, measurement_unit.measurement_system.illuminance_units, Lux
International System of Units, measurement_unit.measurement_system.volume_units, Cubic metre
International System of Units, measurement_unit.measurement_system.electric_charge_density_units, Coulomb per cubic metre
International System of Units, measurement_unit.measurement_system.acceleration_units, Metre per second squared
Kilogram, measurement_unit.mass_unit.measurement_system, International System of Units
Microsiemens, measurement_unit.conductance_unit.measurement_system, International System of Units
Micromolar, measurement_unit.amount_concentration_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.time_units, Picosecond
International System of Units, measurement_unit.measurement_system.surface_density_units, Kilogram per square metre
Hectoliter, measurement_unit.volume_unit.measurement_system, International System of Units
International System of Units, measurement_unit.measurement_system.permeability_units, Henry per metre
International System of Units, measurement_unit.measurement_system.resistivity_units, Ohm meter
zeptosecond, measurement_unit.time_unit.measurement_system, International System of Units
International System of Units, measurement_unit.measurement_system.length_units, Megametre
International System of Units, measurement_unit.measurement_system.time_units, Second
International System of Units, measurement_unit.measurement_system.conductance_units, Millisiemens
International System of Units, measurement_unit.measurement_system.molar_volume_units, Cubic metre per mole
Kilojoule per mole, measurement_unit.molar_energy_unit.energy_in_joules_per_mole, 1000.0
Megapascal, measurement_unit.pressure_unit.measurement_system, International System of Units
International System of Units, measurement_unit.measurement_system.power_units, Milliwatt
International System of Units, measurement_unit.measurement_system.radiant_intensity_units, Watt per steradian
Becquerel, measurement_unit.radioactivity_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.specific_heat_capacity_units, Joule per gram per kelvin
International System of Units, measurement_unit.measurement_system.time_units, zettasecond
International System of Units, measurement_unit.measurement_system.irradiance_units, Watt per square metre
Newton metre, measurement_unit.force_moment_unit.measurement_system, International System of Units
Kilojoule, measurement_unit.energy_unit.energy_in_joules, 1000.0
International System of Units, measurement_unit.measurement_system.length_units, Micrometer
Meter, measurement_unit.distance_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.time_units, Nanosecond
Joule per gram per kelvin, measurement_unit.specific_heat_capacity_unit.measurement_system, International System of Units
Ohm meter, measurement_unit.unit_of_resistivity.measurement_system, International System of Units
International System of Units, measurement_unit.measurement_system.frequency_units, Hertz
International System of Units, measurement_unit.measurement_system.weight_units, Milligram
International System of Units, measurement_unit.measurement_system.volume_units, Cubic kilometer
terasecond, measurement_unit.time_unit.measurement_system, International System of Units
International System of Units, measurement_unit.measurement_system.catalytic_concentration_units, Katal per cubic metre
Joule per cubic metre, measurement_unit.energy_density_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.specific_heat_capacity_units, Joule per kilogram per kelvin
Siemens per meter, measurement_unit.unit_of_conductivity.measurement_system, International System of Units
Nanomolar, measurement_unit.amount_concentration_unit.measurement_system, International System of Units
International System of Units, measurement_unit.measurement_system.weight_units, Gram
Candela, measurement_unit.luminous_intensity_unit.measurement_system, International System of Units
International System of Units, measurement_unit.measurement_system.electric_flux_density_units, Coulomb per square metre
zettasecond, measurement_unit.time_unit.measurement_system, International System of Units
Megahertz, measurement_unit.unit_of_frequency.measurement_system, International System of Units
International System of Units, measurement_unit.measurement_system.energy_units, Kilojoule
International System of Units, measurement_unit.measurement_system.pressure_units, Gigapascal
Milligram, measurement_unit.mass_unit.measurement_system, International System of Units
International System of Units, measurement_unit.measurement_system.data_rate_units, Kilobit per second
Kilometres per hour, measurement_unit.speed_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.exposure_units, Coulomb per kilogram
International System of Units, measurement_unit.measurement_system.power_units, Kilowatt
International System of Units, measurement_unit.measurement_system.wavenumber_units, Reciprocal metre
bit per second, measurement_unit.unit_of_data_transmission_rate.measurement_system, International System of Units
International System of Units, measurement_unit.measurement_system.area_units, Square meter
International System of Units, measurement_unit.measurement_system.time_units, Femtosecond
International System of Units, measurement_unit.measurement_system.luminous_intensity_units, Candela
International System of Units, measurement_unit.measurement_system.time_units, Gigasecond
International System of Units, measurement_unit.measurement_system.speed_units, Kilometres per second
International System of Units, measurement_unit.measurement_system.angular_acceleration_units, Radian per second squared
International System of Units, measurement_unit.measurement_system.area_units, Square kilometer
Joule per mole per kelvin, measurement_unit.molar_heat_capacity_unit.measurement_system, International System of Units
Watt per square metre, measurement_unit.irradiance_unit.measurement_system, International System of Units
Joule, measurement_unit.energy_unit.energy_in_joules, 1.0
Kilometres per second, measurement_unit.speed_unit.measurement_system, International System of Units
Millimeter, measurement_unit.distance_unit.measurement_system, International System of Units
Square meter, measurement_unit.area_unit.measurement_system, International System of Units
International System of Units, measurement_unit.measurement_system.molar_heat_capacity_units, Joule per mole per kelvin
Cubic metre per kilogram, measurement_unit.specific_volume_unit.measurement_system, International System of Units
International System of Units, measurement_unit.measurement_system.current_density_units, Ampere per square metre
Gigabit per second, measurement_unit.unit_of_data_transmission_rate.measurement_system, International System of Units
International System of Units, measurement_unit.measurement_system.magnetic_flux_density_units, Tesla
International System of Units, measurement_unit.measurement_system.time_units, yottasecond
International System of Units, measurement_unit.measurement_system.current_units, Ampere
Milliliter, measurement_unit.volume_unit.measurement_system, International System of Units
International System of Units, user.avh.default_domain.ellerdale_topic.ellerdale_id, 0080-5e5f
Pascal second, measurement_unit.viscosity_unit.measurement_system, International System of Units
Microsecond, measurement_unit.time_unit.measurement_system, International System of Units
Ohm centimeter, measurement_unit.unit_of_resistivity.measurement_system, International System of Units
International System of Units, measurement_unit.measurement_system.time_units, petasecond
International System of Units, measurement_unit.measurement_system.power_units, Watt
yoctosecond, measurement_unit.time_unit.measurement_system, International System of Units
International System of Units, measurement_unit.measurement_system.weight_units, Kilogram
International System of Units, measurement_unit.measurement_system.magnetic_flux_units, Weber
Cubic kilometer, measurement_unit.volume_unit.measurement_system, International System of Units
Tonne, measurement_unit.mass_unit.measurement_system, International System of Units
International System of Units, measurement_unit.measurement_system.time_units, decisecond
International System of Units, measurement_unit.measurement_system.length_units, Decimetre
Henry per metre, measurement_unit.permeability_unit.measurement_system, International System of Units
Mole per cubic metre, measurement_unit.amount_concentration_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
International System of Units, measurement_unit.measurement_system.solid_angle_units, Steradian
International System of Units, measurement_unit.measurement_system.data_rate_units, Terabit per second
International System of Units, measurement_unit.measurement_system.time_units, exasecond
International System of Units, measurement_unit.measurement_system.specific_energy_units, Joule per gram
Newton, measurement_unit.unit_of_force.measurement_system, International System of Units
Joule per kelvin, measurement_unit.heat_capacity_unit.measurement_system, International System of Units
International System of Units, measurement_unit.measurement_system.pressure_units, Pascal
Kilosecond, measurement_unit.time_unit.measurement_system, International System of Units
Weber, measurement_unit.magnetic_flux_unit.measurement_system, International System of Units
Kilopascal, measurement_unit.pressure_unit.measurement_system, International System of Units
International System of Units, measurement_unit.measurement_system.heat_capacity_units, Joule per kelvin
International System of Units, measurement_unit.measurement_system.pressure_units, Kilopascal
Megawatt, measurement_unit.power_unit.measurement_system, International System of Units
Milliwatt, measurement_unit.power_unit.measurement_system, International System of Units
International System of Units, measurement_unit.measurement_system.force_units, Newton
Joule per gram, measurement_unit.specific_energy_unit.measurement_system, International System of Units
International System of Units, measurement_unit.measurement_system.luminous_flux_units, Lumen
Watt, measurement_unit.power_unit.measurement_system, International System of Units
Tesla, measurement_unit.magnetic_flux_density_unit.measurement_system, International System of Units
International System of Units, measurement_unit.measurement_system.angular_velocity_units, Radian per second
Metric system, user.movgp0.default_domain.measurement_system.unit_of_power, Watt
International System of Units, measurement_unit.measurement_system.substance_units, Mole
International System of Units, measurement_unit.measurement_system.time_units, Microsecond
Radian, measurement_unit.angle_unit.measurement_system, International System of Units
International System of Units, measurement_unit.measurement_system.permittivity_units, Farad per metre
International System of Units, measurement_unit.measurement_system.surface_tension_units, Newton per metre
International System of Units, measurement_unit.measurement_system.length_units, Kilometer
Millisiemens, measurement_unit.conductance_unit.measurement_system, International System of Units
International System of Units, measurement_unit.measurement_system.potential_units, Volt
Microsiemens per centimeter, measurement_unit.unit_of_conductivity.measurement_system, International System of Units
International System of Units, measurement_unit.measurement_system.length_units, Meter
International System of Units, measurement_unit.measurement_system.charge_units, Coulomb
Nanometre, measurement_unit.distance_unit.measurement_system, International System of Units
International System of Units, measurement_unit.measurement_system.energy_density_units, Joule per cubic metre
International System of Units, measurement_unit.measurement_system.radioactivity_units, Becquerel
International System of Units, measurement_unit.measurement_system.volume_units, Hectoliter
International System of Units, measurement_unit.measurement_system.time_units, Millisecond
Degree Celsius, measurement_unit.temperature_unit.measurement_system, International System of Units
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.temperature_units, Kelvin
Metre per second squared, measurement_unit.acceleration_unit.measurement_system, International System of Units
Kilohertz, measurement_unit.unit_of_frequency.measurement_system, International System of Units
Joule per cubic metre, measurement_unit.energy_density_unit.density_in_joules_per_cubic_meter, 1.0
petasecond, measurement_unit.time_unit.measurement_system, International System of Units
Ampere per metre, measurement_unit.magnetic_field_strength_unit.measurement_system, International System of Units
Joule per kilogram, measurement_unit.specific_energy_unit.energy_in_joules_per_kilogram, 1.0
Picosecond, measurement_unit.time_unit.measurement_system, International System of Units
Reciprocal metre, measurement_unit.wavenumber_unit.measurement_system, International System of Units
Kilogram per square metre, measurement_unit.unit_of_surface_density.measurement_system, International System of Units
International System of Units, measurement_unit.measurement_system.viscosity_units, Pascal second
International System of Units, measurement_unit.measurement_system.time_units, Attosecond
Lux, measurement_unit.illuminance_unit.measurement_system, International System of Units
Katal per cubic metre, measurement_unit.catalytic_concentration_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.resistivity_units, Ohm centimeter
Femtosecond, measurement_unit.time_unit.measurement_system, International System of Units
hectosecond, measurement_unit.time_unit.measurement_system, International System of Units
Kilojoule, measurement_unit.energy_unit.measurement_system, International System of Units
Watt per square metre per steradian, measurement_unit.radiance_unit.measurement_system, International System of Units
Decametre, measurement_unit.distance_unit.measurement_system, International System of Units
International System of Units, measurement_unit.measurement_system.time_units, Megasecond
International System of Units, measurement_unit.measurement_system.specific_energy_units, Joule per kilogram
Sievert, measurement_unit.dose_equivalence_unit.measurement_system, International System of Units
International System of Units, measurement_unit.measurement_system.molar_energy_units, Joule per mole
International System of Units, measurement_unit.measurement_system.frequency_units, Megahertz
Pascal, measurement_unit.pressure_unit.measurement_system, International System of Units
International System of Units, measurement_unit.measurement_system.frequency_units, Gigahertz
Microgram, measurement_unit.mass_unit.measurement_system, International System of Units
Terabit per second, measurement_unit.unit_of_data_transmission_rate.measurement_system, International System of Units
International System of Units, measurement_unit.measurement_system.inverse_temperature_units, Inverse Kelvin
International System of Units, measurement_unit.measurement_system.volumetric_flow_rate_units, Cubic metre per second
International System of Units, measurement_unit.measurement_system.length_units, Nanometre
International System of Units, measurement_unit.measurement_system.time_units, zeptosecond
International System of Units, measurement_unit.measurement_system.volume_units, Milliliter
International System of Units, measurement_unit.measurement_system.amount_concentration_units, Micromolar
Metre per second, measurement_unit.speed_unit.measurement_system, International System of Units
Estelle, base.yupgrade.user.topics, International System of Units
International System of Units, base.schemastaging.context_name.pronunciation, g.125_p8yyr
Kilometer, measurement_unit.distance_unit.measurement_system, International System of Units
Radian per second, measurement_unit.angular_velocity_unit.measurement_system, International System of Units
International System of Units, measurement_unit.measurement_system.density_units, Kilogram per cubic metre
Hectometre, measurement_unit.distance_unit.measurement_system, International System of Units
Square kilometer, measurement_unit.area_unit.measurement_system, International System of Units
Deciliter, measurement_unit.volume_unit.measurement_system, International System of Units
Decimetre, measurement_unit.distance_unit.measurement_system, International System of Units
International System of Units, measurement_unit.measurement_system.power_units, Megawatt
International System of Units, measurement_unit.measurement_system.data_rate_units, bit per second
Kilowatt, measurement_unit.power_unit.measurement_system, International System of Units
International System of Units, measurement_unit.measurement_system.specific_volume_units, Cubic metre per kilogram
Gray, measurement_unit.absorbed_dose_unit.measurement_system, International System of Units
International System of Units, measurement_unit.measurement_system.angle_units, Radian
Second, measurement_unit.time_unit.measurement_system, International System of Units
International System of Units, measurement_unit.measurement_system.conductance_units, Microsiemens
Coulomb per kilogram, measurement_unit.exposure_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.electric_field_strength_units, Volt per metre
Molar, measurement_unit.amount_concentration_unit.measurement_system, International System of Units
International System of Units, measurement_unit.measurement_system.thermal_conductivity_units, Watt per meter per kelvin
Newton per metre, measurement_unit.surface_tension_unit.measurement_system, International System of Units
International System of Units, measurement_unit.measurement_system.speed_units, Kilometres per hour
International System of Units, measurement_unit.measurement_system.resistance_units, Ohm
International System of Units, measurement_unit.measurement_system.time_units, yoctosecond
International System of Units, measurement_unit.measurement_system.volume_units, Liter
Ohm, measurement_unit.resistance_unit.measurement_system, International System of Units
Cubic metre per mole, measurement_unit.molar_volume_unit.measurement_system, International System of Units
Megabit per second, measurement_unit.unit_of_data_transmission_rate.measurement_system, International System of Units
International System of Units, measurement_unit.measurement_system.amount_concentration_units, Nanomolar
International System of Units, measurement_unit.measurement_system.speed_units, Metre per second
International System of Units, measurement_unit.measurement_system.absorbed_dose_rate_units, Gray per second
Cubic metre, measurement_unit.volume_unit.measurement_system, International System of Units

Answer: Kilojoule
Joule