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
A Dentin 'Primer'? 
Select and explain. 
A. Etches the dentin, B. It increases the surface energy & wets the dentin surface, C. Removes the smear layer, D. Conditions the dentin
B: It increases the surface energy & wets the dentin surface
Answer: B: It increases the surface energy & wets the dentin surface 
Explanation: None