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: Radiology
Best method to reduce radiation caries is: 
Select and explain. 
A. 1% neutral sodium fluoride., B. 2% neutral sodium fluoride., C. 0.5% neutral sodium fluoride., D. All of the above
A: 1% neutral sodium fluoride.
Answer: A: 1% neutral sodium fluoride. 
Explanation: The best method to reduce radiation caries is application of viscous 1% neutral sodium fluoride gel at regular intervals.