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
The best method to reduce radiation caries is application of viscous 
Select and explain. 
A. 0.5% neutral sodium fluoride gel, B. 1% neutral sodium fluoride gel, C. 0.5% stannous fluoride gel, D. 1% stannous fluoride gel
B: 1% neutral sodium fluoride gel
Answer: B: 1% neutral sodium fluoride gel 
Explanation: None