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': 'Nerve damaged in radical mastiodectomy is: \nSelect and explain. \nA. Facial, B. Chochlear, C. Vestibular, D. All', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Complications of mastoid surgery- Total hearing loss/dead ear Facial palsy (rare)', 'role': 'assistant'}]