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: Surgery
[{'content': 'Paial claw hand is caused by lesion involving the:March 2010, March 2013 (a, b) \nSelect and explain. \nA. Radial nerve, B. Ulnar nerve, C. Median nerve, D. Anterior interosseous nerve', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. B: Ulnar Nerve', 'role': 'assistant'}]