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
All of the following are the purpose of liners except: 
Select and explain. 
A. Pulp protection, B. Pulp medication, C. Pulp healing, D. None
C: Pulp healing
Answer: C: Pulp healing 
Explanation: None