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: Dental
Localized necrosis of pulp from cutting burs is 
Select and explain. 
A. Due to heat, B. Due to vibration, C. Due to pressure, D. All of the above
A: Due to heat
Answer: A: Due to heat 
Explanation: None