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
Dental Pulp under any restoration is best protected by 
Select and explain. 
A. Cavity liner, B. Cavity base, C. 2 mm thick dentin, D. All of the above
C: 2 mm thick dentin
Answer: C: 2 mm thick dentin 
Explanation: None