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': 'Most common site for the initiation of otosclerosis is \nSelect and explain. \nA. Food plate of stapes, B. Margins of stapes, C. Fissula ante fenestrum, D. Fissula post fenestrum', 'role': 'user'}, {'content': 'Answer: C \nExplanation: In stapedial otosclerosis which is the most common variety, the lesion stas just in front of the oval window in an area called "fissula ante fenestram". Ref: Diseases of EAR, NOSE, THROAT by PL Dhingra; 7th Edition; page no.95', 'role': 'assistant'}]