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 preferred agent for base formation below restorative 
resin is: 
Select and explain. 
A. Calcium hydroxide, B. Cavity varnish, C. Zinc oxide-eugenol cement, D. None of the above
A: Calcium hydroxide
Answer: A: Calcium hydroxide 
Explanation: None