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
Fluorides mostly deposited on the enamel surface at: 
Select and explain. 
A. Outer surface, B. At DEJ, C. Inner surface, D. Inter prismatic substance
A: Outer surface
Answer: A: Outer surface 
Explanation: None