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: Pathology
Initiation of dental caries depends upon 
Select and explain. 
A. formation of large amount of acid, B. Availability of carbohydrate food, C. Viscosity of saliva, D. Localization of acid over tooth surface
D: Localization of acid over tooth surface
Answer: D: Localization of acid over tooth surface 
Explanation: None