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
Iatrogenic traumatic facial nerve palsy is most commonly caused during - 
Select and explain. 
A. Myringoplasty, B. Stapedectomy, C. Mastoidectomy, D. Ossiculoplasty
C: Mastoidectomy
Answer: C: Mastoidectomy 
Explanation: “All ear operations run the risk of facial nerve damage, particularly if the nerve is exposed. In particular a mastoidectomy has a high risk because a sharp cutting rotating burr is used in close proximity to the nerve.”
Other Operations where Facial Nerve may be Damaged
– Stapedectomy
– Removal of acoustic neuroma