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': 'The complication of using airotor at 30,000 rpm for impacted molar is \nSelect and explain. \nA. Necrosis of bone, B. Tissue laceration, C. Tissue necrosis, D. Emphysema', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]