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: Orthopaedics
[{'content': 'Autonomous zone of ulnar nerve \nSelect and explain. \nA. Tip of middle finger, B. Tip of little finger, C. Dorsum of 1st web space in hand, D. Base of middle finger', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Autonomous zones of nerve\xa0\nUlnar Nerve - Tip of little finger\xa0\nMedian Nerve - Tip of index, middle finger\nRadial Nerve - 1st web space on dorsum of hand\xa0\nDeep Peroneal Nerve - 1st web space on dorsum of foot', 'role': 'assistant'}]