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

Answer: Presidential system
Federal republic