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': "Trimalleolar fracture is \nSelect and explain. \nA. Pott's fracture, B. Cotton's fracture, C. Tillaux fracture, D. Jone's fracture", 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]