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': 'Needle aspiration of a central bone lesion is useful \nSelect and explain. \nA. To rule out a vascular lesion, B. To determine thickness of buccal plate, C. To diagnose traumatic bone cyst, D. To feel root surfaces', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]