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: Unknown
[{'content': 'Which nerve is used for monitoring anesthesia during surgery? \nSelect and explain. \nA. Radial, B. Ulnar, C. Facial, D. Median', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ref. Oxford textbook of anesthesia. Page. 449\n\xa0\nUlnar nerve is monitored because ulnar nerve supplies adductor pollicis muscle which is monitored for neuromuscular blockade during anaesthesia\n\xa0\nNerve Injuries in anesthesia\nIn the\xa0supine position\xa0the main nerves at risk are:\n\nBrachial plexus (excessive abduction and extension of the shoulder, especially if the head is turned away from the abducted arm),\nUlnar nerve (direct compression in ulnar groove, especially if the hand is supinated, or stretching by acute elbow flexion)\nRadial nerve (arm allowed to hang over the side of the operating table)\nSupraorbital (compression by the facemask)', 'role': 'assistant'}]