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 surgery is not done in - \nSelect and explain. \nA. Optic nerve compression, B. CSF rhinorrhea, C. Dacryocystic carcinoma, D. Ethmoidal polyps', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]