Which of the following is not an institutional game in Nigeria ?

Institutional games in Nigeria include NUGA for universities, NIPOGA for polytechnics, and NATCEGA for colleges of education. These organizations run sports competitions for their respective institutions.

NBA stands for National Basketball Association, which is an American professional basketball league. It is not a Nigerian institutional sports organization.

While Nigeria has basketball competitions, NBA is not one of them. All other options are actual Nigerian institutional sports organizations.