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
[{'content': 'Iatrogenic traumatic facial nerve palsy is MOST commonly produced during which of the following surgical procedure? \nSelect and explain. \nA. Myringoplasty, B. Stapedectomy, C. Mastoidectomy, D. Ossiculoplasty', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Iatrogenic facial nerve trauma most often occurs during mastoidectomy. When injury occur to more than 50% of the neural diameter either primary reanastomosis or reconstruction using a nerve graft is done. Complications of mastoidectomy includes: Infection Labrynthitis ossificans Mucosalization of the middle ear Facial nerve injury CSF leak Encephalocele', 'role': 'assistant'}]