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
The complication of using airotor at 30,000 rpm for impacted molar is 
Select and explain. 
A. Necrosis of bone, B. Tissue laceration, C. Tissue necrosis, D. Emphysema
D: Emphysema
Answer: D: Emphysema 
Explanation: None