Who drafts the referendum question?

Nigeria
Answer
Mandatory referendum - Independent electoral commission
Source
Electoral Act
(Enacted in 2010)
http://placng.org/Electoral%20Act%202010-%20as%20Gazetted.pdf
Article 43.
(1) The forms to be used for theconduct of elections to the offices mentioned
in this Act and electionpetitions arising there from shall be determined by the
Commission