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

Answer: Presidential system
Federal republic