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 etching of intact enamel with phosphoric acid produces: 
Select and explain. 
A. an increases in surface area, B. a decrease in surface area, C. An increase in chemical bonding capabilities, D. a decrease in chemical bonding capabilities
A: an increases in surface area
Answer: A: an increases in surface area 
Explanation: None