<prompt> For deviated nasal septum, surgery is required for -a Septal spur with epistaxisb Marked septal deviationc Persistent rhinorrhead Recurrent sinusitise Prolonged DNSabcacdbcdabcd  <response>: Indications for surgeryPersistent unilateral nasal obstruction and recurrent headache.Deviation causing recurrent sinusitis or otitis mediaRecurrent epistaxis from septal spur.Access for operation in polypectomy with DNS.As a part of septorhinoplasty for cosmetic correction of external nasal deformities.As a approach to hypophysectomy 