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 presence of higher amounts of proline-rich proteins
(PRP) can have what kind of effect on caries causation? 
Select and explain. 
A. Caries promoting since they help in bacterial adherence, B. Make tooth surface resistant to caries since it enhance fluoride action, C. It has role during tooth mineralization only therefore no effect on caries., D. Aid in super saturation of saliva therefore make tooth resistant to caries.
D: Aid in super saturation of saliva therefore make tooth resistant to caries.
Answer: D: Aid in super saturation of saliva therefore make tooth resistant to caries. 
Explanation: None