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
When composites are given, exposed dentin should be covered with 
Select and explain. 
A. Varnish, B. Calcium hydroxide, C. Phosphoric acid, D. ZnO eugenol cements
B: Calcium hydroxide
Answer: B: Calcium hydroxide 
Explanation: None