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': "Median nerve injury at the wrist causes - \nSelect and explain. \nA. Claw hand, B. Loss of apposition of thumb, C. Policeman's tip deformity, D. Saturday night palsy", 'role': 'user'}, {'content': 'Answer: B \nExplanation: Injury at the wrist or in carpal tunnel produces low median nerve palsy.\nLong flexors of fingers are spared and there is paralysis of thenar muscles only.\nFollowing features are seen : -\n\n\nPentest for abductor pollicis Brevis paralysis.\nLoss of opposition and abduction of thumb.\nApe thumb deformity\nLoss of sensation of lateral 31/2 fingers and lateral 2/3 of palm.\n\n\nIn contrast to high median nerve palsy, pointing index and Benediction test is not seen as long fexors are spared in low median nerve palsy', 'role': 'assistant'}]