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': "Cotton's fracture is \nSelect and explain. \nA. Avulsion fracture of C7, B. Trimaoleolar, C. Bimalleolar, D. Burst fracture of atlas", 'role': 'user'}, {'content': 'Answer: B \nExplanation: B i.e. Trimalleolar', 'role': 'assistant'}]