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
The hard carious dentin is removed with 
Select and explain. 
A. Excavator, B. Bur at Low speed, C. Bur at high speed, D. None of the above
C: Bur at high speed
Answer: C: Bur at high speed 
Explanation: None