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 kind of political system is used in the political division where the country's anthem is "Nigeria, We Hail Thee"? 
Knowledge Triplets: Presidential system, government.form_of_government.countries, Second Polish Republic
Nigeria, location.country.national_anthem, m.0w8ff8v
Colombia, location.country.form_of_government, Presidential system
Iraq, location.country.form_of_government, Federal republic
Confederate States of America, location.country.form_of_government, Presidential system
Presidential system, government.form_of_government.countries, Nigeria
Composition, freebase.type_profile.published, Published
Federal republic, government.form_of_government.countries, Weimar Republic
Federal republic, government.form_of_government.countries, Nigeria
Composer, freebase.equivalent_topic.equivalent_type, Composer
Nigeria, government.form_of_government.countries, Federal republic
Composer, people.profession.corresponding_type, Composer
Presidential system, government.form_of_government.countries, Venezuela
Mozambique, location.country.form_of_government, Presidential system
Gambia, location.country.form_of_government, Presidential system
Presidential system, government.form_of_government.countries, South Sudan
Anthem, rdf-schema#range, National Anthem
Federal republic, government.form_of_government.countries, United States of America
Brazil, location.country.form_of_government, Presidential system
Lillian Jean Williams, people.person.profession, Lyricist
Chad, location.country.form_of_government, Presidential system
Presidential system, government.form_of_government.countries, Kazakhstan
Federal republic, fictional_universe.fictional_organization_type.organizations, United Federations
Nigeria, We Hail Thee, music.composition.lyricist, Lillian Jean Williams
National Anthem, type.type.domain, Government
Federal republic, government.form_of_government.countries, Tanzania
Federal republic, government.form_of_government.countries, Czech and Slovak Federative Republic
Federal republic, government.form_of_government.countries, Venezuela
Uzbekistan, location.country.form_of_government, Presidential system
National Anthem, common.topic.article, m.03nbgmy
South Korea, location.country.form_of_government, Presidential system
Bolivia, location.country.form_of_government, Presidential system
Presidential system, government.form_of_government.countries, Kyrgyzstan
Guatemala, location.country.form_of_government, Presidential system
m.0w8ff8v, government.national_anthem_of_a_country.country, Nigeria
Comoros, location.country.form_of_government, Federal republic
Nigeria, We Hail Thee, government.national_anthem.national_anthem_of, m.0w8ff8v
Federal republic, government.form_of_government.countries, Russia
United States of America, location.country.form_of_government, Presidential system
Presidential system, government.form_of_government.countries, Republic of Texas
Federal republic, government.form_of_government.countries, Switzerland
Nicaragua, location.country.form_of_government, Presidential system
Bosnia and Herzegovina, location.country.form_of_government, Federal republic
Presidential system, government.form_of_government.countries, Italian Social Republic
Nigeria We Hail Thee, music.recording.song, Nigeria, We Hail Thee
Presidential system, government.form_of_government.countries, Gambia
National Anthem, type.type.properties, National anthem of
Maldives, location.country.form_of_government, Presidential system
Iran, location.country.form_of_government, Presidential system
Frances Berda, common.topic.notable_for, g.12mk_lcpw
Presidential system, government.form_of_government.countries, Algeria
Federal republic, government.form_of_government.countries, West Germany
Federal republic, government.form_of_government.countries, Sudan
m.0w8ff8v, government.national_anthem_of_a_country.country, Nigeria
Composition, freebase.type_profile.strict_included_types, Topic
Presidential system, government.form_of_government.countries, Ecuador
Anthem, type.property.master_property, National anthem of
Presidential system, government.form_of_government.countries, United Arab Emirates
Peru, location.country.form_of_government, Presidential system
National Anthem, freebase.type_profile.strict_included_types, Composition
Eritrea, location.country.form_of_government, Presidential system
Presidential system, government.form_of_government.countries, Uruguay
Presidential system, government.form_of_government.countries, Armenia
Ivory Coast, location.country.form_of_government, Presidential system
Presidential system, user.avh.default_domain.ellerdale_topic.ellerdale_id, 0080-9549
Sudan, location.country.form_of_government, Federal republic
Presidential system, government.form_of_government.countries, Namibia
Sudan, location.country.form_of_government, Presidential system
Uruguay, location.country.form_of_government, Presidential system
Musical Recording, freebase.type_hints.included_types, Topic
Guam, location.country.form_of_government, Presidential system
Algeria, location.country.form_of_government, Presidential system
Seychelles, location.country.form_of_government, Presidential system
Nigeria, We Hail Thee, music.composition.composer, Frances Berda
Nigeria, We Hail Thee, common.topic.notable_types, National Anthem
Presidential system, government.form_of_government.countries, Eritrea
Nigeria, We Hail Thee, common.topic.article, m.0w7q9r3
Presidential system, government.form_of_government.countries, Confederate States of America
Nigeria We Hail Thee, common.topic.notable_for, g.125d0zj13
Presidential system, government.form_of_government.countries, Panama
Federal republic, government.form_of_government.countries, Bosnia and Herzegovina
Presidential system, government.form_of_government.countries, Chad
National Anthem, freebase.type_profile.strict_included_types, Topic
m.010vsw91, dataworld.gardening_hint.last_referenced_by, Presidential system
Presidential system, government.form_of_government.countries, Ghana
Venezuela, location.country.form_of_government, Presidential system
Nigeria We Hail Thee, common.topic.notable_types, Musical Recording
Presidential system, base.schemastaging.context_name.pronunciation, g.125_ql64_
Czechoslovak Socialist Republic, location.country.form_of_government, Federal republic
Federated States of Micronesia, location.country.form_of_government, Presidential system
Brazil, location.country.form_of_government, Federal republic
Yemen, location.country.form_of_government, Presidential system
Presidential system, government.form_of_government.countries, Brazil
Presidential system, government.form_of_government.countries, Congo
Presidential system, government.form_of_government.countries, Nagorno-Karabakh Republic
Weimar Republic, location.country.form_of_government, Federal republic
Palau, location.country.form_of_government, Presidential system
Ethiopia, location.country.form_of_government, Federal republic
United States of America, location.country.form_of_government, Federal republic
Namibia, location.country.form_of_government, Presidential system
Presidential system, government.form_of_government.countries, Bolivia
Presidential system, government.form_of_government.countries, Sierra Leone
Presidential system, government.form_of_government.countries, Argentina
Uganda, location.country.form_of_government, Presidential system
Presidential system, government.form_of_government.countries, Mexico
Topic, freebase.type_profile.published, Published
Federal republic, government.form_of_government.countries, Mexico
Lillian Jean Williams, people.person.nationality, United Kingdom
Presidential system, government.form_of_government.countries, Republic of the Congo
Federal republic, government.form_of_government.countries, Somalia
Tanzania, location.country.form_of_government, Presidential system
El Salvador, location.country.form_of_government, Presidential system
Lillian Jean Williams, music.lyricist.lyrics_written, Nigeria, We Hail Thee
Chile, location.country.form_of_government, Presidential system
Turkmenistan, location.country.form_of_government, Presidential system
South Sudan, location.country.form_of_government, Presidential system
Gabon, location.country.form_of_government, Presidential system
Presidential system, government.form_of_government.countries, Azerbaijan
Presidential system, government.form_of_government.countries, Seychelles
Czech and Slovak Federative Republic, location.country.form_of_government, Federal republic
Zambia, location.country.form_of_government, Presidential system
Congo, location.country.form_of_government, Presidential system
Federal republic, base.ontologies.ontology_instance.equivalent_instances, m.07nhchw
Presidential system, government.form_of_government.countries, Malawi
m.07nhchw, base.ontologies.ontology_instance_mapping.freebase_topic, Federal republic
Presidential system, government.form_of_government.countries, Federated States of Micronesia
Mexico, location.country.form_of_government, Presidential system
Presidential system, government.form_of_government.countries, Chechen Republic of Ichkeria
Liberia, location.country.form_of_government, Presidential system
Lyricist, freebase.type_profile.published, Published
Republic of Texas, location.country.form_of_government, Presidential system
United Arab Emirates, location.country.form_of_government, Presidential system
Federal republic, government.form_of_government.countries, Socialist Federal Republic of Yugoslavia
Lillian Jean Williams, common.topic.notable_for, g.12mk_tmly
French Second Republic, location.country.form_of_government, Presidential system
Paraguay, location.country.form_of_government, Presidential system
Tanzania, location.country.form_of_government, Federal republic
National Anthem, freebase.type_profile.published, Published
Presidential system, government.form_of_government.countries, Yemen
Pakistan, location.country.form_of_government, Federal republic
Kyrgyzstan, location.country.form_of_government, Presidential system
Presidential system, government.form_of_government.countries, Puntland
Musical Recording, freebase.type_profile.published, Published
Presidential system, government.form_of_government.countries, Colombia
Northern Mariana Islands, location.country.form_of_government, Presidential system
Lyricist, freebase.type_profile.equivalent_topic, Lyricist
Rwanda, location.country.form_of_government, Presidential system
Federal republic, government.form_of_government.countries, South Sudan
Presidential system, government.form_of_government.countries, Sudan
Nigeria, We Hail Thee, music.composition.recordings, Nigeria We Hail Thee
Costa Rica, location.country.form_of_government, Presidential system
Presidential system, government.form_of_government.countries, Tanzania
South Sudan, location.country.form_of_government, Federal republic
Anthem, type.property.expected_type, National Anthem
Panama, location.country.form_of_government, Presidential system
Kenya, location.country.form_of_government, Presidential system
m.0w8ff8v, government.national_anthem_of_a_country.anthem, Nigeria, We Hail Thee
Federal republic, government.form_of_government.countries, Czechoslovak Socialist Republic
Frances Berda, music.composer.compositions, Nigeria, We Hail Thee
Lyricist, freebase.equivalent_topic.equivalent_type, Lyricist
Republic of the Congo, location.country.form_of_government, Presidential system
Presidential system, government.form_of_government.countries, Chile
Ghana, location.country.form_of_government, Presidential system
Chechen Republic of Ichkeria, location.country.form_of_government, Presidential system
Nigeria, location.country.form_of_government, Presidential system
Nigeria We Hail Thee, music.recording.artist, Keziah Jones
Presidential system, government.form_of_government.countries, Costa Rica
Azerbaijan, location.country.form_of_government, Presidential system
Nigeria, location.country.form_of_government, Federal republic
Ecuador, location.country.form_of_government, Presidential system
Musical Recording, freebase.type_profile.strict_included_types, Topic
Presidential system, government.form_of_government.countries, Kenya
First Spanish Republic, location.country.form_of_government, Presidential system
Federal republic, government.form_of_government.countries, Argentina
Presidential system, government.form_of_government.countries, Angola
Frances Berda, people.person.profession, Composer
Sierra Leone, location.country.form_of_government, Presidential system
Presidential system, government.form_of_government.countries, Ivory Coast
National Anthem, type.type.expected_by, Anthem
Composer, freebase.type_profile.strict_included_types, Topic
Presidential system, government.form_of_government.countries, Myanmar
National Anthem, freebase.type_hints.included_types, Topic
Second Polish Republic, location.country.form_of_government, Presidential system
Presidential system, government.form_of_government.countries, Liberia
Presidential system, government.form_of_government.countries, Indonesia
Socialist Federal Republic of Yugoslavia, location.country.form_of_government, Federal republic
Federal republic, government.form_of_government.countries, Pakistan
Presidential system, government.form_of_government.countries, El Salvador
Malawi, location.country.form_of_government, Presidential system
Nepal, location.country.form_of_government, Federal republic
Composer, freebase.type_profile.published, Published
Guinea, location.country.form_of_government, Presidential system
Musical Recording, freebase.type_profile.kind, Definition
Mexico, location.country.form_of_government, Federal republic
Presidential system, government.form_of_government.countries, Gabon
Presidential system, government.form_of_government.countries, Guinea
Germany, location.country.form_of_government, Federal republic
Somalia, location.country.form_of_government, Federal republic
Presidential system, government.form_of_government.countries, Tajikistan
Marshall Islands, location.country.form_of_government, Presidential system
Venezuela, location.country.form_of_government, Federal republic
Presidential system, government.form_of_government.countries, Republic of Afghanistan
Federal republic, government.form_of_government.countries, Nepal
Federal republic, government.form_of_government.countries, Austria
Angola, location.country.form_of_government, Presidential system
Presidential system, government.form_of_government.countries, Maldives
Presidential system, government.form_of_government.countries, Mozambique
Nigeria We Hail Thee, music.recording.releases, Nigerian Wood
Republic of Hawaii, location.country.form_of_government, Presidential system
Nigeria, We Hail Thee, common.topic.notable_for, g.12ml082hv
Federal republic, government.form_of_government.countries, Germany
Presidential system, government.form_of_government.countries, French Second Republic
Composer, freebase.type_hints.included_types, Topic
Presidential system, government.form_of_government.countries, United States of America
Transnistria, location.country.form_of_government, Presidential system
Armenia, location.country.form_of_government, Presidential system
Lillian Jean Williams, common.topic.notable_types, Lyricist
Presidential system, government.form_of_government.countries, Turkmenistan
Presidential system, government.form_of_government.countries, Northern Mariana Islands
Philippines, location.country.form_of_government, Presidential system
Nagorno-Karabakh Republic, location.country.form_of_government, Presidential system
Presidential system, government.form_of_government.countries, Guam
Lyricist, freebase.type_profile.strict_included_types, Topic
Federal republic, government.form_of_government.countries, Ethiopia
Republic of Afghanistan, location.country.form_of_government, Presidential system
Presidential system, government.form_of_government.countries, Republic of Hawaii
Presidential system, government.form_of_government.countries, Equatorial Guinea
Nigeria, We Hail Thee, government.national_anthem.national_anthem_of, m.0w8ff8v
Presidential system, government.form_of_government.countries, Palau
Austria, location.country.form_of_government, Federal republic
Nigeria, government.form_of_government.countries, Presidential system
Lyricist, freebase.type_hints.included_types, Topic
Composition, freebase.type_profile.kind, Definition
Tajikistan, location.country.form_of_government, Presidential system
Composer, freebase.type_profile.equivalent_topic, Composer
National Anthem, freebase.type_hints.included_types, Composition
Presidential system, government.form_of_government.countries, Cyprus
Composition, freebase.type_hints.included_types, Topic
Presidential system, government.form_of_government.countries, South Korea
India, location.country.form_of_government, Federal republic
Presidential system, government.form_of_government.countries, Marshall Islands
Presidential system, government.form_of_government.countries, Rwanda
Presidential system, government.form_of_government.countries, Nicaragua
National Anthem, freebase.type_profile.equivalent_topic, National anthem
Argentina, location.country.form_of_government, Presidential system
Puntland, location.country.form_of_government, Presidential system
Federal republic, government.form_of_government.countries, Comoros
Italian Social Republic, location.country.form_of_government, Presidential system
Switzerland, location.country.form_of_government, Federal republic
National Anthem, freebase.type_profile.kind, Definition
Presidential system, government.form_of_government.countries, Belarus
Presidential system, government.form_of_government.countries, Paraguay
Equatorial Guinea, location.country.form_of_government, Presidential system
Nigeria We Hail Thee, music.recording.tracks, Nigeria We Hail Thee
Kazakhstan, location.country.form_of_government, Presidential system
Russia, location.country.form_of_government, Federal republic
Frances Berda, common.topic.notable_types, Composer
Federal republic, government.form_of_government.countries, India
Presidential system, government.form_of_government.countries, Iran
Presidential system, government.form_of_government.countries, Uzbekistan
m.0r1g7_q, dataworld.gardening_hint.last_referenced_by, Federal republic
United Federations, fictional_universe.fictional_organization.type_of_organization, Federal republic
National anthem, freebase.equivalent_topic.equivalent_type, National Anthem
Argentina, location.country.form_of_government, Federal republic
Myanmar, location.country.form_of_government, Presidential system
West Germany, location.country.form_of_government, Federal republic
Keziah Jones, people.person.nationality, Nigeria
Federal republic, user.avh.default_domain.ellerdale_topic.ellerdale_id, 0080-d81e
Presidential system, government.form_of_government.countries, Peru
Presidential system, government.form_of_government.countries, Zambia
Cyprus, location.country.form_of_government, Presidential system
Presidential system, government.form_of_government.countries, First Spanish Republic
Federal republic, government.form_of_government.countries, Brazil
Belarus, location.country.form_of_government, Presidential system
Presidential system, government.form_of_government.countries, Transnistria
Presidential system, government.form_of_government.countries, Uganda
Indonesia, location.country.form_of_government, Presidential system
Presidential system, government.form_of_government.countries, Philippines
Federal republic, government.form_of_government.countries, Iraq
Presidential system, government.form_of_government.countries, Guatemala

Answer: Presidential system
Federal republic