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: What is the political system where Roman Senate is a governmental body? 
Knowledge Triplets: Russian Empire, location.country.form_of_government, Autocracy
Topic, freebase.type_profile.published, Published
m.04_hvp8, media_common.dedication.work_dedicated, Temple of Trajan
Governmental Body, type.type.properties, Sessions
Roman Senate, government.government_position_held.governmental_body, m.0w_k7yp
m.0w5j7ss, government.government_position_held.governmental_body, Roman Senate
Governmental body (if position is part of one), rdf-schema#range, Governmental Body
Roman Senate, common.topic.notable_types, Governmental Body
Catiline Orations, symbols.namesake.named_after, Catiline
Roman Senate, common.topic.article, m.0403vfc
Governmental Body, freebase.type_hints.included_types, Topic
Roman Empire, location.country.form_of_government, Autocracy
m.0w5j7ss, government.government_position_held.office_holder, Quintus Marcius Barea Sura
Maccari-Cicero, common.image.appears_in_topic_gallery, Cicero
Governmental Body, type.type.properties, Members
Roman Senate, common.topic.image, Maccari-Cicero
Maccari-Cicero, common.image.appears_in_topic_gallery, Quousque tandem abutere, Catilina, patientia nostra?
Maccari-Cicero, common.image.appears_in_topic_gallery, Senate of the Roman Republic
Catiline Orations, common.topic.image, Maccari-Cicero
Governmental Body, type.type.properties, Jurisdiction
Roman Senate, government.governmental_body.members, m.0w_k7yp
Rhetoric, common.topic.image, Maccari-Cicero
autocracy.noun.01, base.wordnet.synset.equivalent_topic, Autocracy
Governmental Body, type.type.domain, Government
Cicero, common.topic.image, Maccari-Cicero
Maccari-Cicero, common.image.appears_in_topic_gallery, Public speaking
Maccari-Cicero, common.image.appears_in_topic_gallery, Constitution of the Roman Republic
Governmental Body, freebase.type_profile.strict_included_types, Agent
Quintus Marcius Barea Sura, government.politician.government_positions_held, m.0w5j7ss
Autocracy, government.form_of_government.countries, Byzantine Empire
Governmental body (if position is part of one), type.property.reverse_property, Members
m.04_hvp8, media_common.dedication.dedicated_by, Roman Senate
Tsardom of Russia, location.country.form_of_government, Autocracy
Congress Poland, location.country.form_of_government, Autocracy
m.0w_k7yp, government.government_position_held.jurisdiction_of_office, Roman Empire
Roman Senate, base.schemastaging.context_name.pronunciation, g.125_l6gl7
Governmental Body, type.type.properties, Component bodies
Governmental Body, type.type.expected_by, Component bodies
Governmental Body, type.type.expected_by, Parliament
Maccari-Cicero, common.image.size, m.03rz5xl
Legislature, type.property.expected_type, Governmental Body
Maccari-Cicero, common.image.appears_in_topic_gallery, Proto-globalization
Roman Empire, location.country.form_of_government, Autocracy
Roman consul, government.government_office_or_title.office_holders, m.0w_k7yp
Autocracy, government.form_of_government.countries, Russian Empire
Trajan, media_common.dedicatee.dedications, m.04_hvp8
Governmental Body, type.type.properties, Date formed
Marcus Lollius, government.politician.government_positions_held, m.0w_k7yp
Governmental body (if position is part of one), type.property.expected_type, Governmental Body
m.0w_k7yp, government.government_position_held.governmental_body, Roman Senate
m.0w_k7yp, government.governmental_jurisdiction.governing_officials, Roman Empire
Governmental body (if position is part of one), owl#inverseOf, Members
Autocracy, government.form_of_government.countries, Congress Poland
Governmental Body, type.type.expected_by, Governmental body (if any)
m.0w5j7ss, government.government_position_held.basic_title, Senator
Governmental Body, freebase.type_profile.kind, Definition
Governmental Body, type.type.expected_by, Governmental Body (if Position Is Part of One)
Nazi Germany, location.country.form_of_government, Autocracy
Date dissolved, type.property.schema, Governmental Body
Governmental Body, type.type.expected_by, Governmental body (if position is part of one)
Governmental Body, type.type.expected_by, Introduced in
Governmental Body, type.type.expected_by, Government Body Lobbied
Temple of Trajan, media_common.dedicated_work.dedication, m.04_hvp8
m.0w_k7yp, government.government_position_held.office_position_or_title, Roman consul
Autocracy, government.form_of_government.countries, Roman Empire
Roman Senate, government.governmental_body.members, m.0w5j7ss
Maccari-Cicero, common.image.appears_in_topic_gallery, Catiline Orations
Governmental Body, type.type.expected_by, Body this is a component of
Governmental Body, type.type.properties, Date dissolved
Governmental Body, type.type.properties, Offices/Positions Within the Body
Catiline, common.topic.image, Maccari-Cicero
Trajan, people.person.nationality, Roman Empire
Autocracy, government.form_of_government.countries, Tsardom of Russia
Governmental Body, freebase.type_profile.strict_included_types, Abstract
Roman Senate, common.topic.notable_for, g.1256chy2t
Governmental Body, freebase.type_profile.strict_included_types, Topic
Maccari-Cicero, common.image.appears_in_topic_gallery, Rhetoric
m.04_hvp8, media_common.dedication.dedicated_to, Pompeia Plotina
Date formed, type.property.schema, Governmental Body
Legislature, rdf-schema#range, Governmental Body
Autocracy, government.form_of_government.countries, Nazi Germany
Governmental Body, type.type.expected_by, Court system
Governmental Body, type.type.properties, Body this is a component of
Roman Senate, media_common.dedicator.dedications, m.04_hvp8
Governmental Body, freebase.type_profile.published, Published
m.04_hvp8, media_common.dedication.dedicated_to, Trajan
Legislature, type.property.reverse_property, Sessions
Pompeia Plotina, media_common.dedicatee.dedications, m.04_hvp8
m.0w_k7yp, government.government_position_held.office_holder, Marcus Lollius
Maccari-Cicero, common.image.appears_in_topic_gallery, Cesare Maccari
Autocracy, government.form_of_government.countries, Francoist Spain
Maccari-Cicero, common.image.appears_in_topic_gallery, Auctoritas
Date dissolved, rdf-schema#domain, Governmental Body
m.0v7h19n, dataworld.gardening_hint.last_referenced_by, Autocracy
Byzantine Empire, location.country.form_of_government, Autocracy
Governmental Body, type.type.expected_by, Legislative Body
Maccari-Cicero, common.image.appears_in_topic_gallery, Catiline
Maccari-Cicero, common.image.appears_in_topic_gallery, Roman Senate
Legislature, owl#inverseOf, Sessions
Catiline, symbols.name_source.namesakes, Catiline Orations
Governmental Body, type.type.properties, Committees
Governmental Body, type.type.expected_by, Government bodies
m.0w_k7yp, government.government_position_held.basic_title, Senator
Maccari-Cicero, common.image.appears_in_topic_gallery, Roman law
Date formed, rdf-schema#domain, Governmental Body
Autocracy, base.schemastaging.context_name.pronunciation, g.11btvx1x_j
Roman Empire, government.governmental_jurisdiction.governing_officials, m.0w_k7yp
Governmental Body, common.topic.article, m.02xlj1f
Francoist Spain, location.country.form_of_government, Autocracy
Governmental Body, type.type.expected_by, Legislature

Answer: Autocracy