Speaker
Legislative branch
The House of Representatives is presided over by the Speaker of the House of Representatives. It has 360 members, who are elected for four-year terms in single-seat constituencies. The Senate, which has 109 members, is presided over by the President of the Senate.

The federal government is composed of three distinct branches: legislative, executive, and judicial, whose powers are vested by the Constitution of Nigeria in the National Assembly, the President, and the federal courts, including the Supreme Court, respectively.

The National Assembly (the upper legislative arm) of the Federal Republic of Nigeria is a bicameral legislature established under section 4 of the Nigerian Constitution. It consists of a Senate with 109 members and a 360-member House of Representatives. The body, modelled after the federal Congress of the United States, is supposed to guarantee equal representation of the 36 states irrespective of size in the Senate and proportional representation of population in the House. The National Assembly, like many other organs of the Nigerian government, is based in the Federal Capital Territory, Abuja.

The Senate is chaired by the President of the Nigerian Senate or Senate President, the first of whom was Nnamdi Azikiwe, who stepped down from the job to become the country's first Head of State. The House is chaired by the Speaker of the House of Representatives. At any joint session of the Assembly, the President of the Senate presides and in his absence the Speaker of the House presides.

I Believe the correct answer should be the speaker