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
Which of the following pa of the ear is most commonly involved in otosclerosis? 
Select and explain. 
A. Oval window, B. Round window, C. Tympanic membrane, D. Malleus
A: Oval window
Answer: A: Oval window 
Explanation: While otosclerosis may potentially involve any pa of the bony labyrinth, it carries a distinct predilection for the region near the anterior border of the oval window (fissula ante fenestram).