Which one of the following is not a ground for divorce under the Hindu Marriage Act, 1955?

Under Section 13(1) of the Hindu Marriage Act, 1955, conversion to another religion (clause (ii)), incurably of unsound mind or mental disorder (clause (iii)), and suffering from venereal disease in a communicable form (clause (v)) are statutory grounds for divorce. Epilepsy is not a ground for divorce under Section 13, and reference to recurrent attacks of epilepsy in Section 5(ii)(c) was omitted by the Marriage Laws (Amendment) Act, 1999.