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
The 37% hydrophosphoric acid typically dissolves about _____________ micrometer of enamel surface and creates a zone of etched enamel rods for about 15-25 micrometer 
Select and explain. 
A. 5-10 microns, B. 1-5 microns, C. 10-15 microns, D. >15 microns
A: 5-10 microns
Answer: A: 5-10 microns 
Explanation: None