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
As far as the raise of frictional heat, in using various rotary cutting instruments is concerned which one of the following is the most kind to the pulp 
Select and explain. 
A. Stainless steel bur, B. Diamond bur, C. carbide bur, D. Carbon steel bur
C: carbide bur
Answer: C: carbide bur 
Explanation: None