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': 'Severe disease involves \nSelect and explain. \nA. Lunate, B. Tibial tubercle, C. Calcaneum, D. Navicular', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is 'c' i.e., Calcaneum", 'role': 'assistant'}]