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': "A Bennett's fracture is difficult to maintain in a reduced position mainly because of the pull of the \nSelect and explain. \nA. Flexor pollicis longus, B. Flexor pollicis brevis, C. Extensor pollicis brevis, D. Abductor pollicis longus", 'role': 'user'}, {'content': 'Answer: D \nExplanation: D i.e. Abductor pollicis longus', 'role': 'assistant'}]