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 currency is used in the country that is ruled by the Prime minister of Senegal? 
Knowledge Triplets: Government Office or Title, freebase.type_profile.kind, Definition
Basic title, type.property.expected_type, Government office category
Office, position, or title, type.property.expected_type, Government Office or Title
Prime minister, common.topic.image, Robert Walpole, the longest serving Prime Minister (1721-1742
m.0113qnly, freebase.valuenotation.is_reviewed, From
m.0k0cr6r, government.government_position_held.office_position_or_title, Prime Minister of Senegal
Prime Minister of Senegal, common.topic.notable_types, Government Office or Title
benin franc.noun.01, base.wordnet.synset.equivalent_topic, West African CFA franc
Prime Minister of Senegal, government.government_office_or_title.office_holders, m.0j5_fwt
Government office category, type.type.domain, Government
Government Office or Title, type.type.expected_by, Office, Position, or Title
Prime minister, common.topic.notable_for, g.1257bh6nq
m.0k0cr6r, government.government_position_held.jurisdiction_of_office, Senegal
Abdoulaye Wade, government.political_appointer.appointees, m.0j5_fwt
Prime minister, book.book_subject.works, The Prime Minister
Abdoul Mbaye, people.person.nationality, Senegal
m.0113qnly, government.government_position_held.jurisdiction_of_office, Senegal
Prime Minister of Senegal, government.government_office_or_title.office_holders, m.0wz9g8r
m.0j5_fwt, government.government_position_held.appointed_by, Abdoulaye Wade
m.010xb009, dataworld.gardening_hint.last_referenced_by, West African CFA franc
West African CFA franc, finance.currency.countries_used, Ivory Coast
Macky Sall, government.politician.government_positions_held, m.0j5vvhf
Souleymane Ndéné Ndiaye, government.politician.government_positions_held, m.0j5_fwt
m.0wz9g8r, government.government_position_held.appointed_by, Macky Sall
m.0113qnly, freebase.valuenotation.is_reviewed, Appointed By (if Position is Appointed)
senegalese franc.noun.01, base.wordnet.synset.equivalent_topic, West African CFA franc
Prime minister, common.topic.image, Stephen Harper
Niger, location.country.currency_used, West African CFA franc
Office, position, or title, owl#inverseOf, Office Holders
Government Office or Title, freebase.type_profile.strict_included_types, Non-Agent
Mohammed Dionne, people.person.nationality, Senegal
Prime minister, base.onephylogeny.type_of_thing.things_of_this_type, Pierre Trudeau
Government Office or Title, type.type.properties, Governmental body (if any)
Senegal, government.governmental_jurisdiction.governing_officials, m.0113qnly
Prime Minister of Senegal, government.government_office_or_title.office_holders, m.0wz9g8r
m.09xpqqg, common.webpage.topic, Prime minister
Government Office or Title, type.type.properties, Office Holders
Government Office or Title, type.type.properties, Category
m.0113qnly, freebase.valuenotation.is_reviewed, Officeholder
West African CFA franc, finance.currency.countries_used, Burkina Faso
m.0113qnly, government.government_position_held.office_position_or_title, Prime Minister of Senegal
Abdoul Mbaye, government.politician.government_positions_held, m.0k0b_70
Macky Sall, people.person.nationality, Senegal
Aminata Touré, government.politician.government_positions_held, m.0wz9g8r
Stephen Harper, common.image.appears_in_topic_gallery, Prime minister
m.0113qnly, freebase.valuenotation.is_reviewed, Jurisdiction of office
Government Office or Title, type.type.expected_by, Title of Chief Executive
Prime Minister of Senegal, common.topic.article, m.05pmz4
m.0k0b_70, government.government_position_held.jurisdiction_of_office, Senegal
Senegal, government.governmental_jurisdiction.governing_officials, m.0k0b_70
Senegal, government.governmental_jurisdiction.governing_officials, m.0j5_fwt
Burkina Faso, location.country.currency_used, West African CFA franc
m.09klh01, base.ontologies.ontology_instance_mapping.freebase_topic, Prime minister
m.0j5_fwt, government.government_position_held.office_holder, Souleymane Ndéné Ndiaye
m.0wz9g8r, government.government_position_held.jurisdiction_of_office, Senegal
m.0j5vvhf, government.government_position_held.office_position_or_title, Prime Minister of Senegal
Prime Minister of Senegal, government.government_office_or_title.category, Prime minister
The Prime Minister, book.written_work.subjects, Prime minister
Cheikh Hadjibou Soumaré, people.person.nationality, Senegal
Government Office or Title, type.type.expected_by, Office
Government Office or Title, freebase.type_profile.published, Published
m.0113qnly, freebase.valuenotation.is_reviewed, Office, position, or title
m.0j5vvhf, government.government_position_held.basic_title, Prime minister
Topic, freebase.type_profile.published, Published
Senegal, government.governmental_jurisdiction.governing_officials, m.0j5vvhf
Senegal, government.governmental_jurisdiction.governing_officials, m.0k0cr6r
m.0113qnly, freebase.valuenotation.is_reviewed, Basic title
Government office category, freebase.type_profile.strict_included_types, Topic
Government Office or Title, common.topic.article, m.02xlj1v
Office, position, or title, rdf-schema#range, Government Office or Title
Government Office or Title, type.type.expected_by, Offices
Souleymane Ndéné Ndiaye, people.person.nationality, Senegal
m.0k0cr6r, government.government_position_held.basic_title, Prime minister
m.0113qnly, government.government_position_held.office_holder, Mohammed Dionne
Government Office or Title, freebase.type_hints.included_types, Topic
m.0k0b_70, government.government_position_held.office_holder, Abdoul Mbaye
m.0113qnly, freebase.valuenotation.has_no_value, To
Prime minister, common.topic.article, m.060bz
Prime Minister of Senegal, government.government_office_or_title.office_holders, m.0k0b_70
Government office category, type.type.properties, Offices
Robert Walpole, the longest serving Prime Minister (1721-1742, common.image.appears_in_topic_gallery, Prime minister
m.0wz9g8r, government.government_position_held.basic_title, Prime minister
m.0wz9g8r, government.government_position_held.office_holder, Aminata Touré
Ivory Coast, location.country.currency_used, West African CFA franc
m.0wz9g8r, government.government_position_held.jurisdiction_of_office, Senegal
Cheikh Hadjibou Soumaré, government.politician.government_positions_held, m.0k0cr6r
Government Office or Title, type.type.expected_by, Government positions
Government Office or Title, type.type.expected_by, Offices/Positions Within the Body
West African CFA franc, finance.currency.prefix_symbol, CFA
Prime minister, common.topic.notable_types, Government office category
m.0113qnly, government.government_position_held.basic_title, Prime minister
m.0k0b_70, government.government_position_held.basic_title, Prime minister
m.0b45zhs, common.webpage.topic, Prime minister
m.0113qnly, government.government_position_held.appointed_by, Macky Sall
m.0j5_fwt, government.government_position_held.office_position_or_title, Prime Minister of Senegal
KevinRuddZoom, common.image.appears_in_topic_gallery, Prime minister
Government Office or Title, freebase.type_profile.strict_included_types, Topic
West African CFA franc, finance.currency.countries_used, Niger
Mali, location.country.currency_used, West African CFA franc
Prime minister, base.schemastaging.context_name.pronunciation, g.125_khp8z
Prime minister, common.topic.image, KevinRuddZoom
Office, position, or title, type.property.reverse_property, Office Holders
m.0j5vvhf, government.government_position_held.jurisdiction_of_office, Senegal
Aminata Touré, people.person.nationality, Senegal
Macky Sall, government.political_appointer.appointees, m.0113qnly
m.0k0b_70, government.government_position_held.appointed_by, Macky Sall
Government Office or Title, freebase.type_profile.strict_included_types, Abstract
Prime minister, base.ontologies.ontology_instance.equivalent_instances, m.09klh01
Macky Sall, government.political_appointer.appointees, m.0wz9g8r
Senegal, location.country.currency_used, West African CFA franc
Prime Minister of Senegal, government.government_office_or_title.office_holders, m.0k0cr6r
m.0k0b_70, government.government_position_held.office_position_or_title, Prime Minister of Senegal
Government Office or Title, type.type.expected_by, Office, position, or title
Prime minister, common.topic.webpage, m.0b45zhs
Benin, location.country.currency_used, West African CFA franc
Mohammed Dionne, government.politician.government_positions_held, m.0113qnly
m.0j5_fwt, government.government_position_held.basic_title, Prime minister
Prime Minister of Senegal, common.topic.notable_for, g.125d4xlxq
Senegal, government.governmental_jurisdiction.governing_officials, m.0wz9g8r
West African CFA franc, finance.currency.currency_code, XOF
Macky Sall, government.political_appointer.appointees, m.0k0b_70
m.0j5_fwt, government.government_position_held.jurisdiction_of_office, Senegal
West African CFA franc, finance.currency.countries_used, Senegal
West African CFA franc, finance.currency.countries_used, Mali
m.0k0cr6r, government.government_position_held.office_holder, Cheikh Hadjibou Soumaré
Senegal, finance.currency.countries_used, West African CFA franc
Government office category, freebase.type_hints.included_types, Topic
Government office category, type.type.expected_by, Category
Basic title, rdf-schema#range, Government office category
m.0j5vvhf, government.government_position_held.office_holder, Macky Sall
m.0wz9g8r, government.government_position_held.office_position_or_title, Prime Minister of Senegal
Prime Minister of Senegal, government.government_office_or_title.office_holders, m.0113qnly
Guinea-Bissau, location.country.currency_used, West African CFA franc
Prime Minister of Senegal, government.government_office_or_title.office_holders, m.0j5vvhf
West African CFA franc, finance.currency.countries_used, Guinea-Bissau
Government office category, type.type.expected_by, Basic title
Government Office or Title, type.type.domain, Government
Prime minister, common.topic.webpage, m.09xpqqg
Government Office or Title, type.type.properties, Jurisdiction
West African CFA franc, finance.currency.countries_used, Benin

Answer: West African CFA franc