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What is For deviated nasal septum, surgery is required for -a) Septal spur with epistaxisb) Marked septal deviationc) Persistent rhinorrhead) Recurrent sinusitise) Prolonged DNS and explain in detail?
Indications for surgery

Persistent unilateral nasal obstruction and recurrent headache.
Deviation causing recurrent sinusitis or otitis media
Recurrent 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