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
Type 2 pattern of etched enamel is also known as: 
Select and explain. 
A. Honeycomb pattern, B. Soap bubble pattern, C. Cobble stone pattern, D. Pyramid pattern
C: Cobble stone pattern
Answer: C: Cobble stone pattern 
Explanation: According to Silverstone et al and Galil Wright 
Type I

Selective removal of enamel prism cores.
Peripheries intact (honeycomb appearance).

Type II 

 Reverse process.
 Peripheries removed.
 Cores intact (cobble stone appearance  with prism edges lost).

Type III is the mixture of pattern I and II.
Type IV – Pitted enamel with map like appearance.
Type V – flat smooth surfaces