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
[{'content': 'One of the following is the best of provent pulp damage during cavity preparation \nSelect and explain. \nA. retain smear layer, B. Use sharp burs with brush stroke, C. use surface anesthesia, D. use adequate water coolant', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]