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: gram per cubic centimetre is the unit of density in which measurement system? 
Knowledge Triplets: Centimetre–gram–second system of units, user.movgp0.default_domain.measurement_system.base_units, Kelvin
Gauss, measurement_unit.magnetic_flux_density_unit.measurement_system, Centimetre–gram–second system of units
Centimetre–gram–second system of units, user.movgp0.default_domain.measurement_system.unit_of_time, Second
Gram per cubic centimetre, measurement_unit.unit_of_density.density_in_kg_per_cu_m, 1000.0
m.075xzy_, type.permission.controls, Density
Density, type.property.unique, false
m.04_5396, user.tsegaran.random.taxonomy_entry.subject, Density
m.09vj0jk, base.yupgrade.user.topics, Density
m.0r1gl8g, dataworld.gardening_hint.last_referenced_by, Density
Gram per cubic centimetre, measurement_unit.unit_of_density.measurement_system, Centimetre–gram–second system of units
Density, user.collord.materials_science.materials_property.materials_property_type, Mechanical property
Abcoulomb, measurement_unit.charge_unit.measurement_system, Centimetre–gram–second system of units
Gal, measurement_unit.acceleration_unit.measurement_system, Centimetre–gram–second system of units
Measured material, type.type.properties, Density
Centimetre–gram–second system of units, measurement_unit.measurement_system.magnetic_field_strength_units, Oersted
Abampere, measurement_unit.current_unit.measurement_system, Centimetre–gram–second system of units
Centimetre–gram–second system of units, measurement_unit.measurement_system.magnetic_flux_density_units, Gauss
Centimetre–gram–second system of units, measurement_unit.measurement_system.length_units, Centimeter
m.0j_wnc2, base.fbontology.predicate_path.properties, Density
Density, type.property.expected_type, Floating Point Number
Density, type.object.permission, m.04j6y0m
m.0j_wnc2, base.fbontology.predicate_path.prop, Density
Density, type.property.schema, Measured material
Mean density, type.property.unique, true
m.0hmw8fx, type.permission.controls, Mean density
m.05yq_gf, type.permission.controls, Density
Density, type.object.permission, m.075xzy_
Centimetre–gram–second system of units, base.schemastaging.context_name.pronunciation, g.125_mqyp3
m.07ndyq8, base.ontologies.ontology_instance_mapping.freebase_topic, Density
Mean density, type.property.schema, Celestial object extra
Erg, measurement_unit.energy_unit.measurement_system, Centimetre–gram–second system of units
Floating Point Number, type.type.expected_by, Mean density
Oersted, measurement_unit.magnetic_field_strength_unit.measurement_system, Centimetre–gram–second system of units
Centimetre–gram–second system of units, measurement_unit.measurement_system.speed_units, Centimetre per second
Density, user.tsegaran.random.taxonomy_subject.entry, m.04_5396
Density, type.object.permission, m.05yq_gf
Density, type.property.schema, Solid Material
Density, measurement_unit.dimension.units, Kilogram per cubic metre
Centimetre–gram–second system of units, user.movgp0.default_domain.measurement_system.base_units, Centimeter
Density, base.schemastaging.context_name.pronunciation, g.125_nt37n
Centimetre–gram–second system of units, user.movgp0.default_domain.measurement_system.base_units, Gram
Centimetre–gram–second system of units, measurement_unit.measurement_system.pressure_units, Barye
Centimetre–gram–second system of units, user.movgp0.default_domain.measurement_system.unit_of_lenght, Centimeter
Density, type.object.permission, m.025d6_q
Solid Material, type.type.properties, Density
Density, measurement_unit.dimension.units, Gram per cubic centimetre
Centimetre per second, measurement_unit.speed_unit.measurement_system, Centimetre–gram–second system of units
Density, user.avh.default_domain.ellerdale_topic.ellerdale_id, 0099-a62a
m.0n9j0v5, base.fbontology.predicate_path.prop, Mean density
m.04j6y0m, type.permission.controls, Density
Centimetre–gram–second system of units, measurement_unit.measurement_system.acceleration_units, Gal
Density, user.collord.materials_science.materials_property.si_unit, Kilogram per cubic metre
Centimeter, measurement_unit.distance_unit.measurement_system, Centimetre–gram–second system of units
Density, type.property.unit, Gram per cubic centimetre
Barye, measurement_unit.pressure_unit.measurement_system, Centimetre–gram–second system of units
m.0h7jk8x, dataworld.gardening_hint.last_referenced_by, Centimetre–gram–second system of units
Centimetre–gram–second system of units, measurement_unit.measurement_system.luminance_units, Stilb
Density, measurement_unit.dimension.si_base_unit, Kilogram per cubic metre
m.07vn7ph, base.yupgrade.user.topics, Density
m.0n9j0v5, base.fbontology.predicate_path.properties, Mean density
Centimetre–gram–second system of units, measurement_unit.measurement_system.charge_units, Statcoulomb
Density, base.ontologies.ontology_instance.equivalent_instances, m.07ndyq8
Centimetre–gram–second system of units, measurement_unit.measurement_system.charge_units, Abcoulomb
Floating Point Number, type.type.expected_by, Density
Density, type.property.unique, true
Mean density, type.property.unit, Gram per cubic centimetre
m.025d6_q, type.permission.controls, Density
Centimetre–gram–second system of units, measurement_unit.measurement_system.current_units, Abampere
Centimetre–gram–second system of units, user.movgp0.default_domain.measurement_system.unit_of_temperature, Kelvin
Mean density, type.object.permission, m.0hmw8fx
Density, type.property.schema, Infobox_mineral
cgs.noun.01, base.wordnet.synset.equivalent_topic, Centimetre–gram–second system of units
Centimetre–gram–second system of units, measurement_unit.measurement_system.energy_units, Erg
Density, type.property.schema, Chemical Compound
Celestial object extra, type.type.properties, Mean density
Centimetre–gram–second system of units, measurement_unit.measurement_system.density_units, Gram per cubic centimetre
Statcoulomb, measurement_unit.charge_unit.measurement_system, Centimetre–gram–second system of units
density.noun.01, base.wordnet.synset.equivalent_topic, Density
Mean density, type.property.expected_type, Floating Point Number
Stilb, measurement_unit.luminance_unit.measurement_system, Centimetre–gram–second system of units
Infobox_mineral, type.type.properties, Density
Centimetre–gram–second system of units, user.movgp0.default_domain.measurement_system.unit_of_mass, Gram
Centimetre–gram–second system of units, user.movgp0.default_domain.measurement_system.base_units, Second
Chemical Compound, type.type.properties, Density

Answer: Centimetre–gram–second system of units