Question: Who is the president of the senate in the country Yisa Braimoh was in?

full_context: Document 1: Age of candidacy: In Nigeria, a person must be at least 35 years of age to be elected President or Vice President, 30 to be a Senator or State Governor, and 25 to be a Representative in parliament.
Document 2: Yisa Braimoh: Yisa Braimoh (born 12 August 1942) was elected Senator for Edo North constituency of Edo State, Nigeria, taking office on 29 May 2007. He is a member of the People's Democratic Party (PDP).
Document 3: Isa Yuguda: Mallam Isa Yuguda was elected Governor of Bauchi State, Nigeria in April 2007 on the All Nigeria Peoples Party (ANPP) platform.
Document 4: Ibrahim Bio: Alhaji Isa Ibrahim Bio (born April 1957) was appointed by President Umaru Yar'Adua as Nigeria's Minister of Transportation on 17 December 2008.
Document 5: Vice President of Nigeria: The Vice President of Nigeria is the second - in - command to the President of Nigeria in the Government of Nigeria. Officially styled Vice President of the Federal Republic of Nigeria, the Vice President is elected alongside the President in national elections. The office is currently held by Yemi Osinbajo.
Document 6: United States Senate: The presiding officer of the Senate is the Vice President of the United States, who is President of the Senate. In the Vice President's absence, the President Pro Tempore, who is customarily the senior member of the party holding a majority of seats, presides over the Senate. In the early 20th century, the practice of majority and minority parties electing their floor leaders began, although they are not constitutional officers.
Document 7: Zainab Abdulkadir Kure: Hajiya Zainab Abdulkadir Kure (born 24 November 1959) was elected Senator for the Niger South constituency of Niger State, Nigeria, taking office on 29 May 2007. She is a member of the People's Democratic Party (PDP).
Document 8: Social Democratic Party (Nigeria): After the banning of 13 prospective parties by the administration of Ibrahim Babangida in 1989. Some of the associations decided to re-align. The People's Front of Nigeria, People's Solidarity Party and the Nigerian Labor Party were the three main inchoate groups that emerged to form the core constituency of the new SDP. The leadership of the party was mostly dominated by Northern Nigerians, with Babagana Kingibe elected party chairman in 1990 over his rival Mohammed Arzika. On the other hand, the electoral strength of the party lain in the Yoruba states and Imo and Anambra states. The party won 57% of the Senate seats in the 1992 National Assembly election, and won 53% of the seats of the House of Representatives in the same election. The party was largely financed by the Federal Government and a few individuals, such as Shehu Musa Yar'Adua, Francis Nzeribe and M.K.O. Abiola. The first presidential primary election conducted by the party, Yar'adua collated about 480,000 votes dominating his primary opponent, Olu Falae in the first round. However, those elections were cancelled by Babangida. In second primary election under an adopted system called Option A4, another financier, Abiola (a former member of the National Council of Nigeria and the Cameroons and once a state chairman of the National Party of Nigeria) won the primary election on March 1993, after the first election was canceled. Abiola's contested the national election which was later annulled, a seemingly coherent legacy of Nigeria's swivelling and revolving door like historical political landscape.
Document 9: Abubakar Mahdi: Abubakar Mahdi was elected Senator for the Borno South constituency of Borno State, Nigeria at the start of the Nigerian Fourth Republic, running on the People's Democratic Party (PDP) platform. He took office on 29 May 1999.
Document 10: Nigeria: Nigeria is a Federal Republic modelled after the United States, with executive power exercised by the president. It is influenced by the Westminster System model[citation needed] in the composition and management of the upper and lower houses of the bicameral legislature. The president presides as both Head of State and head of the national executive; the leader is elected by popular vote to a maximum of two 4-year terms. In the March 28, 2015 presidential election, General Muhammadu Buhari emerged victorious to become the Federal President of Nigeria, defeating then incumbent Goodluck Jonathan.
Document 11: Patrick Aga: Patrick Aga was elected Senator for the Nasarawa North constituency of Nasarawa State, Nigeria at the start of the Nigerian Fourth Republic, running on the People's Democratic Party (PDP) platform. He took office on 29 May 1999.
Document 12: President of Nigeria: The President of the Federal Republic of Nigeria is the head of state and head of the national executive of Nigeria. The President of Nigeria is also the commander - in - chief of the Nigerian Armed Forces. The President is elected in national elections which take place every four years. The first President of Nigeria was Nnamdi Azikiwe, who took office on 1 October 1963. The current President, Muhammadu Buhari, took office on 29 May 2015 as the 15th President of the Federal Republic of Nigeria.
Document 13: Georgia State Senate: The presiding officer of the Senate is the President of the Senate. A President Pro Tempore, usually a high - ranking member of the majority party, acts as President in case of the temporary disability of the President. In case of the death, resignation, or permanent disability of the President or in the event of the succession of the President to the executive power, the President Pro Tempore becomes President. The Senate also has as an officer the Secretary of the Senate.
Document 14: Deputy President of the Nigerian Senate: Deputy Senate Presidents of Nigeria Deputy Senate President Term Party Ibrahim Mantu 1999 - 2007 PDP Ike Ekweremadu 2007 - present PDP
Document 15: President of the Senate of Nigeria: The President of the Senate is the presiding officer of the Senate of Nigeria, elected by its membership. The Senate President is second in line for succession to the Nigerian presidency, after the Vice President of Nigeria. The current President of the Senate is Bukola Saraki.
ground_truth: Bukola Saraki
sub_queries: Which country was Yisa Braimoh in? Answer: Nigeria
who is the president of the senate in Nigeria Answer: Bukola Saraki