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': '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: Cochlear otosclerosis causes sensorineural hearing loss probably due to the liberation of toxic materials into the inner ear fluid, so tinnitus is heard. Clinical features Hearing loss Paracusis willisii Tinnitus: It is more commonly seen in cochlear otosclerosis and in active lesions. Veigo Speech Ref: Diseases of EAR, NOSE and THROAT by PL Dhingra; 7th Edition; page no.95, 96', 'role': 'assistant'}]