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 mastoidectomy is - \nSelect and explain. \nA. Facial, B. Cochlear, C. Vestibular, D. All', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Complications of radical mastoidectomy\n\nInjury to facial nerve\nDislocation of incus\nInjury to horizontal semicircular canal. The patient will have post-operative giddiness and nystagmus.\nInjury to sigmoid sinus with profuse bleeding.\nInjury to the dura of middle cranial fossa.', 'role': 'assistant'}]