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
Principle functions of bases are all except: 
Select and explain. 
A. Mechanical protection of pulp, B. Chemical protection of pulp, C. Thermal protection of pulp, D. None
B: Chemical protection of pulp
Answer: B: Chemical protection of pulp 
Explanation: None