Who decides the final ballot text when the initiative is put to a vote?

Citizens Initiated Referenda Act 1993

( Enacted on 28 September 1993)

http://www.legislation.govt.nz/act/public/1993/0101/latest/DLM317193.html?search=ts_act%40bill%40regulation%40deemedreg_citizens_resel_25_h&p=1

Article 11,Determination ofprecise question.

(1)The Clerk of theHouse of Representatives shall determine the wording of the precise question tobe put to voters in the proposed indicative referendum.