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

Answer: Presidential system
Federal republic