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
One of the following is the best of provent pulp damage during cavity preparation 
Select and explain. 
A. retain smear layer, B. Use sharp burs with brush stroke, C. use surface anesthesia, D. use adequate water coolant
D: use adequate water coolant
Answer: D: use adequate water coolant 
Explanation: None