This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Upper Limb Traumatology, Subject name: Orthopaedics
[{'content': "Which of the following is not a complication of a malunited Colles fracture: \nSelect and explain. \nA. Rupture of flexor pollicis longus, B. Carpal instability, C. Carpal tunnel syndrome, D. Sudeck's osteodystrophy", 'role': 'user'}, {'content': 'Answer: A \nExplanation: Rupture of extensor pollicis longus is a complication of colles fracture NOT Flexor pollicis longus. COMPLICATIONS:- Extensor pollicis longus rupture Loss of reduction and secondary deformity Median nerve compression Distal radioulnar joint injury Extension of Colles fracture into the RU joint has a worse prognosis.', 'role': 'assistant'}]