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: atomic mass unit is part of what measurement system? 
Knowledge Triplets: Molecular mass, type.property.schema, Infobox_mineral
m.075xzy_, type.permission.controls, Molecular mass
m.0qn08p5, dataworld.gardening_hint.last_referenced_by, Atomic mass unit
Molecular mass, type.property.expected_type, Floating Point Number
Mass, measurement_unit.dimension.units, Catty
Astronomical unit, measurement_unit.distance_unit.measurement_system, Non-SI units mentioned in the SI
Non-SI units mentioned in the SI, measurement_unit.measurement_system.weight_units, Atomic mass unit
Non-SI units mentioned in the SI, measurement_unit.measurement_system.solid_angle_units, Square degree
mass unit.noun.01, base.wordnet.synset.hyponymy, atomic mass unit.noun.01
Uncertainty, type.property.unit, Atomic mass unit
Mass, measurement_unit.dimension.units, Electron rest mass
Non-SI units mentioned in the SI, measurement_unit.measurement_system.pressure_units, Bar
Mass, type.object.permission, m.025d6_q
Non-SI units mentioned in the SI, measurement_unit.measurement_system.time_units, Hour
Mass, measurement_unit.dimension.units, Ounce
Mass, base.schemastaging.context_name.pronunciation, g.125_l6gm1
Mass (Physics), base.skosbase.skos_concept.equivalent_topic, Mass
Infobox_mineral, type.type.properties, Molecular mass
Mass, user.avh.default_domain.ellerdale_topic.ellerdale_id, 0080-0198
Atomic mass, type.type.properties, Uncertainty
Non-SI units mentioned in the SI, measurement_unit.measurement_system.weight_units, Tonne
m.025d6_q, type.permission.controls, Mass
Atomic mass, type.type.properties, Mass
Mass, measurement_unit.dimension.units, Dram
Mass, base.skosbase.vocabulary_equivalent_topic.equivalent_concept, Mass (Physics)
m.07s1l_7, base.wordnet.word_sense.sense, atomic mass unit.noun.01
Non-SI units mentioned in the SI, measurement_unit.measurement_system.length_units, Astronomical unit
Mass, measurement_unit.dimension.units, Jupiter mass
Mass, measurement_unit.dimension.units, Planetary mass
Mass, measurement_unit.dimension.units, Picul
m.0123pbzp, base.fbontology.predicate_path.prop_2, Mass
Non-SI units mentioned in the SI, measurement_unit.measurement_system.angle_units, Degree
m.0123pbzp, base.fbontology.predicate_path.properties, Mass
Mass, measurement_unit.dimension.units, Cash
Mass, measurement_unit.dimension.units, Milligram
Mass, measurement_unit.dimension.units, Short quarter
atomic mass unit.noun.01, base.wordnet.synset.lexname, noun.quantity
Second of arc, measurement_unit.angle_unit.measurement_system, Non-SI units mentioned in the SI
Mass, measurement_unit.dimension.units, MeV/c²
Mass, measurement_unit.dimension.units, Tael
Mass, measurement_unit.dimension.units, Grain
m.025d6_q, type.permission.controls, Uncertainty
Mass, measurement_unit.dimension.units, Atomic mass unit
Atomic mass unit, base.schemastaging.context_name.pronunciation, g.125_nqqmb
Uncertainty, type.property.schema, Atomic mass
Mass, measurement_unit.dimension.units, Earth mass
Non-SI units mentioned in the SI, measurement_unit.measurement_system.energy_units, Megaelectronvolt
m.0qplrls, dataworld.gardening_hint.last_referenced_by, Mass
m.0qn08p5, type.object.permission, m.019h
m.0123pbz6, base.fbontology.predicate_path.properties, Mass
Megaelectronvolt, measurement_unit.energy_unit.measurement_system, Non-SI units mentioned in the SI
Hectare, measurement_unit.area_unit.measurement_system, Non-SI units mentioned in the SI
Molecular mass, type.property.unit, Atomic mass unit
atomic mass unit.noun.01, base.wordnet.synset.hypernym, mass unit.noun.01
m.019h, type.permission.controls, m.0qn08p5
Square degree, measurement_unit.solid_angle_unit.measurement_system, Non-SI units mentioned in the SI
Non-SI units mentioned in the SI, measurement_unit.measurement_system.time_units, Day
Millibar, measurement_unit.pressure_unit.measurement_system, Non-SI units mentioned in the SI
Mass, measurement_unit.dimension.units, Pennyweight
Mass, measurement_unit.dimension.units, Troy pound
atomic mass unit.noun.01, base.wordnet.synset.gloss, unit of mass for expressing masses of atoms or molecules
Mass, base.ontologies.ontology_instance.equivalent_instances, m.07nfbgl
Hour, measurement_unit.time_unit.measurement_system, Non-SI units mentioned in the SI
Floating Point Number, type.type.expected_by, Uncertainty
Non-SI units mentioned in the SI, measurement_unit.measurement_system.angle_units, Minute of arc
Mass, measurement_unit.dimension.units, Long quarter
Minute, measurement_unit.time_unit.measurement_system, Non-SI units mentioned in the SI
atomic mass unit.noun.01, base.wordnet.synset.syntactic_category, Noun
Mass, measurement_unit.dimension.units, Mace
m.075_7gq, base.yupgrade.user.topics, Mass
Angular mil, measurement_unit.angle_unit.measurement_system, Non-SI units mentioned in the SI
Floating Point Number, type.type.expected_by, Mass
atomic mass unit.noun.01, base.wordnet.synset.equivalent_topic, Atomic mass unit
Atomic mass unit, user.benvvalk.default_domain.moby_output_descriptor.uri, http://ncicb.nci.nih.gov/xml/owl/EVS/Thesaurus.owl#Atomic_Mass_Unit
Mass, measurement_unit.dimension.units, Short ton
Atomic mass unit, measurement_unit.mass_unit.weightmass_in_kilograms, 1.660538782e-27
Mass, measurement_unit.dimension.units, Stone
Mass, type.property.expected_type, Floating Point Number
Atomic mass unit, measurement_unit.mass_unit.measurement_system, Non-SI units mentioned in the SI
Mass, measurement_unit.dimension.units, Candareen
Mass, type.property.schema, Atomic mass
Mass, measurement_unit.dimension.units, Troy ounce
Mass, measurement_unit.dimension.units, Gram
Uncertainty, type.property.unique, true
Mass, measurement_unit.dimension.si_base_unit, Kilogram
Minute of arc, measurement_unit.angle_unit.measurement_system, Non-SI units mentioned in the SI
Non-SI units mentioned in the SI, base.schemastaging.context_name.pronunciation, g.125_q35jr
Mass, measurement_unit.dimension.units, Long ton
Non-SI units mentioned in the SI, measurement_unit.measurement_system.volume_units, Liter
Mass, measurement_unit.dimension.units, Microgram
noun.quantity, base.wordnet.lexical_name.synsets, atomic mass unit.noun.01
Uncertainty, type.property.expected_type, Floating Point Number
Uncertainty, type.object.permission, m.025d6_q
Mass, measurement_unit.dimension.units, Hundredweight
Mass, measurement_unit.dimension.units, Kilogram
Molecular mass, type.property.unique, true
Mass, measurement_unit.dimension.units, Carat
Mass, measurement_unit.dimension.units, Planck mass
Mass, measurement_unit.dimension.units, Pound
m.07vn7ph, base.yupgrade.user.topics, Mass
m.07nfbgl, base.ontologies.ontology_instance_mapping.freebase_topic, Mass
Mass, measurement_unit.dimension.units, Tonne
mass.noun.01, base.wordnet.synset.equivalent_topic, Mass
Mass, measurement_unit.dimension.units, Solar mass
Molecular mass, type.object.permission, m.075xzy_
Mass, type.property.unique, true
Degree, measurement_unit.angle_unit.measurement_system, Non-SI units mentioned in the SI
Non-SI units mentioned in the SI, measurement_unit.measurement_system.angle_units, Second of arc
g.125_nqqmb, base.schemastaging.pronunciation.yomigana, とういつげんししつりょうたんい
atomic mass unit.noun.01, base.wordnet.synset.word, m.07s1l_7
Non-SI units mentioned in the SI, measurement_unit.measurement_system.energy_units, Electronvolt
Bar, measurement_unit.pressure_unit.measurement_system, Non-SI units mentioned in the SI
Mass, measurement_unit.dimension.units, Cental
m.0tfn3w7, dataworld.gardening_hint.last_referenced_by, m.0qn08p5
m.0123pbz6, base.fbontology.predicate_path.prop_2, Mass
Non-SI units mentioned in the SI, measurement_unit.measurement_system.area_units, Hectare
Day, measurement_unit.time_unit.measurement_system, Non-SI units mentioned in the SI
Non-SI units mentioned in the SI, measurement_unit.measurement_system.time_units, Minute
Floating Point Number, type.type.expected_by, Molecular mass
Wired, base.yupgrade.user.topics, Mass
Tonne, measurement_unit.mass_unit.measurement_system, Non-SI units mentioned in the SI
Liter, measurement_unit.volume_unit.measurement_system, Non-SI units mentioned in the SI
Mass, type.property.unit, Atomic mass unit
Electronvolt, measurement_unit.energy_unit.measurement_system, Non-SI units mentioned in the SI
Non-SI units mentioned in the SI, measurement_unit.measurement_system.angle_units, Angular mil
Ana Marie Cox, base.yupgrade.user.topics, Mass
m.04kdl2t, dataworld.gardening_hint.replaced_by, Atomic mass unit
Non-SI units mentioned in the SI, measurement_unit.measurement_system.pressure_units, Millibar

Answer: Non-SI units mentioned in the SI