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
Which of the following etching pattern is optimal for bonding? 
Select and explain. 
A. Type 1, B. Type II, C. Type III, D. Type IV
A: Type 1
Answer: A: Type 1 
Explanation: Three types of etched patterns are noted. They are:

 Type I: Etched enamel surface in which the center of enamel rods is dissolved with periphery intact
 Type II: There is peripheral dissolution of enamel rods
 Type III: It is a combination of the above two patterns

For optimum bond strength, Type I pattern is preferred.