Ariz. Rev. Stat. § 25-314
A. The verified petition in a proceeding for dissolution of marriage, annulment or legal separation shall allege that the marriage is irretrievably broken or void, that one or both of the parties desire to live separate and apart or, if the marriage is a covenant marriage, any of the grounds prescribed in section 25-903 or 25-904, whichever is appropriate, and shall set forth:
C. The only defense to a petition is: