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
In otosclerosis, tinnitus is due to 
Select and explain. 
A. Cochlear otosclerosis, B. Increased vascularity in lesion, C. Conductive deafness, D. All
A: Cochlear otosclerosis
Answer: A: Cochlear otosclerosis 
Explanation: 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