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
Which of the following factors in the stephan's curve is related to the caries incidence and sugar intake: 
Select and explain. 
A. Physical form of sugar, B. Frequency of sugar intake, C. Ph of plaque, D. Quantity of sugar intake
C: Ph of plaque
Answer: C: Ph of plaque 
Explanation: None