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: the measurement system canadian units of measurement uses which unit for volume? 
Knowledge Triplets: Canadian units of measurement, measurement_unit.volume_unit.measurement_system, Pint (Imperial)
m.019h, type.permission.controls, m.0tj6pks
Fluid ounce (imperial), measurement_unit.volume_unit.measurement_system, Canadian units of measurement
Gallon (Imperial), measurement_unit.volume_unit.volume_in_cubic_meters, 0.00454609
Canadian units of measurement, measurement_unit.measurement_system.volume_units, Pint (Imperial)
Gallon (Imperial), measurement_unit.volume_unit.measurement_system, Imperial unit system
Imperial unit system, measurement_unit.measurement_system.volume_units, Gallon (Imperial)
Pint (Imperial), measurement_unit.volume_unit.measurement_system, Canadian units of measurement
Volume, measurement_unit.dimension.units, Pint (Imperial)
Quart (Imperial), measurement_unit.volume_unit.measurement_system, Imperial unit system
Volume, measurement_unit.dimension.units, Gallon (Imperial)
Fluid ounce (imperial), measurement_unit.volume_unit.measurement_system, Imperial unit system
quart.noun.02, base.wordnet.synset.equivalent_topic, Quart (Imperial)
Fluid ounce (imperial), measurement_unit.volume_unit.volume_in_cubic_meters, 2.84130625e-05
Imperial unit system, measurement_unit.measurement_system.volume_units, Quart (Imperial)
m.0tj6pks, type.object.permission, m.019h
m.0tmgnqy, dataworld.gardening_hint.last_referenced_by, m.0tj6pj4
m.0tj6pks, dataworld.gardening_hint.last_referenced_by, Canadian units of measurement
m.0tj6pj4, dataworld.gardening_hint.last_referenced_by, Canadian units of measurement
Canadian units of measurement, measurement_unit.volume_unit.measurement_system, Quart (Imperial)
Imperial unit system, user.movgp0.default_domain.measurement_system.unit_of_volume, Pint (Imperial)
m.0tvrvnf, dataworld.gardening_hint.last_referenced_by, m.0tj6pks
Pint (Imperial), measurement_unit.volume_unit.volume_in_cubic_meters, 0.00056826125
Imperial unit system, measurement_unit.measurement_system.volume_units, Pint (Imperial)
Quart (Imperial), measurement_unit.volume_unit.measurement_system, Canadian units of measurement
Canadian units of measurement, measurement_unit.measurement_system.volume_units, Gallon (Imperial)
Canadian units of measurement, measurement_unit.measurement_system.volume_units, Quart (Imperial)
m.019h, type.permission.controls, m.0tj6pj4
fluidounce.noun.01, base.wordnet.synset.equivalent_topic, Fluid ounce (imperial)
Quart (Imperial), measurement_unit.volume_unit.volume_in_cubic_meters, 0.0011365225
m.0tj6pj4, type.object.permission, m.019h
Volume, measurement_unit.dimension.units, Quart (Imperial)
gallon.noun.02, base.wordnet.synset.equivalent_topic, Gallon (Imperial)
Imperial unit system, user.movgp0.default_domain.measurement_system.unit_of_volume, Gallon (Imperial)
Volume, measurement_unit.dimension.units, Fluid ounce (imperial)
Pint (Imperial), measurement_unit.volume_unit.measurement_system, Imperial unit system
Imperial unit system, measurement_unit.measurement_system.volume_units, Fluid ounce (imperial)
Imperial unit system, user.movgp0.default_domain.measurement_system.unit_of_volume, Fluid ounce (imperial)
Canadian units of measurement, measurement_unit.measurement_system.volume_units, Fluid ounce (imperial)
Gallon (Imperial), measurement_unit.volume_unit.measurement_system, Canadian units of measurement

Answer: Fluid ounce (imperial)
Gallon (Imperial)
Quart (Imperial)
Pint (Imperial)