This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: ENT
[{'content': 'For deted nasal septum, surgery is required for: \nSelect and explain. \nA. Septal spur with epistaxis, B. Marked septal detion, C. Persistent rhinorrhea, D. All', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Indications for Surgery in DNS Persistent unilateral nasal obstruction and recurrent headaches Detion causing recurrent sinusitis or otitis media Recurrent epistaxis from septal spur Access for operation in polypectomy with DNS As a pa of septorhinoplasty for cosmetic correction of external nasal deformities. As a approach to hypophysectomy', 'role': 'assistant'}]