Who drafts the referendum question?

Law 8492 Referendum regulations (Decreto 8492 para laRegulaci?n del refer?ndum) arts 6.b), 12.a) and 13.a)

http://aceproject.org/ero-en/regions/americas/CR/costa-rica-decreto-8492-para-la-regulacion-del

The respective applicant, who can be one or morecitizens, one or more deputies or the President.