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': 'Endoscopic nasal surgery is indicated in- \nSelect and explain. \nA. Chronic sinusitis, B. Epistaxis, C. Both, D. None', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]