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': 'In otosclerosis, tinnitus is due to - \nSelect and explain. \nA. Cochlear otosclerosis, B. Increased vascularity in lesion, C. Conductive deafness, D. All', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]