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 pattern of enamel etching results in formation of honey comb appearance? 
Select and explain. 
A. Type I, B. Type II, C. Type III, D. Type IV
A: Type I
Answer: A: Type I 
Explanation: 3 types of patten given in Sturdevant  

Type 1 - dissolution of prism core-HONEY COMB APPEARANCE.  
Type II – dissolution of prism periphery COBBLESTONE APPEARANCE. 
Type III - less distinct pattern, mixture of 1 and 2. 

Silverstone gave 5 types. 

Type IV - pitted enamel as well as structures that look like unfinished puzzle,maps or network. 
Type V - flat smooth surface.