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': "All of the following diseases have a consistent symptom of tinnitus, except - \nSelect and explain. \nA. Meniere's disease, B. CSOM, C. Otosclerosis, D. Mastoiditis", 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]