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
For a bonding agent to be effective wetting angle should be 
Select and explain. 
A. Minimum with dental hard tissue, B. Minimum with dentin and Maximum with enamel, C. Maximum with dentin and Minimum with enamel, D. Maximum with dental hard tissue
A: Minimum with dental hard tissue
Answer: A: Minimum with dental hard tissue 
Explanation: None