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
Most Common site of perilymph fistula is 
Select and explain. 
A. Round window, B. Oval window, C. Otic capsule, D. Attic
B: Oval window
Answer: B: Oval window 
Explanation: In this condition perilymph leaks into the middle ear. Footplate of stapes is fixed on oval window. It can occur as a complication of stapedectomy, or ear surgery when stapes is dislocated, and also from sudden pressure change in the middle ear. (Ref: Diseases of EAR, NOSE AND THROAT by PL DHINGRA - 6th Edition)