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': "During fixation of Bennett's fracture, which muscle hinders it : \nSelect and explain. \nA. Extensor pollicis brevis, B. Flexor pollicis brevis, C. Flexor pollicis longus, D. Abductor pollicis longus", 'role': 'user'}, {'content': "Answer: D \nExplanation: Following are the deforming forces in Bennett's fracture :\n\nAt the distal fragment, it is the adductor pollicis.\nAt the proximal fragment, it is the abductor pollicis longus.", 'role': 'assistant'}]