This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Ear, Subject name: ENT
[{'content': "Carhart's notch in audiometry is seen in: \nSelect and explain. \nA. Ossicular discontinuity, B. Hemotympanum, C. Otomycosis, D. Otosclerosis", 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans. d. OtosclerosisCarhart s notch seen in otosclerosis.Bone conduction curve shows maximum loss at 2000 Hz.', 'role': 'assistant'}]