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': "Most common charcot's joints involved in diabetes mellitus are those of - \nSelect and explain. \nA. Shoulder, B. Ankle, C. Knee, D. Foot", 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]