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': 'Cottons fracture is fracture of \nSelect and explain. \nA. Foot, B. Knee, C. Ankle, D. Hip', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ankle', 'role': 'assistant'}]