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': "Epley's maneuver - \nSelect and explain. \nA. Positional vertigo, B. Otosclerosis, C. ASOM, D. CSOM", 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]