Who drafts the referendum question?

Nauru
Answer
The format of the question is defined by law
Source
ReferendumProcedures Act 2009
(adoptedin 27 November 2009)
http://aceproject.org/ero-en/regions/pacific/NR/nauru-referendum-procedures-act-2009/view
Section 15.
(1) Theballot paper for an Article 84 referendum must be in the form of the Schedule,
Form 1.
(2) Theballot paper for an Article 84A referendum must be in the form of the Schedule,
Form 2.
Comment