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': 'Feature in otosclerosis include - \nSelect and explain. \nA. Sounds not heard in noisy environment, B. Normal tympanum, C. More common in males, D. Malleus is most commonly affected', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]