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': "The complication of Colles' fracture is \nSelect and explain. \nA. Radial nerve palsy, B. Stiffness of wrist joint, C. Ulnar nerve palsy, D. None of the above", 'role': 'user'}, {'content': 'Answer: B \nExplanation: B i.e. Stiffness of wrist', 'role': 'assistant'}]