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
The selection of a pulp protecting agent does not depend on: 
Select and explain. 
A. Remaining dentin thickness, B. Choice of restorative material, C. Symptoms of the patient, D. Stage of tooth development
D: Stage of tooth development
Answer: D: Stage of tooth development 
Explanation: The base is selected according to:

Design of the cavity
Type of permanent restorative material used
Proximity of the pulp to the cavity walls