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
Duraphat is: 
Select and explain. 
A. Lacquer, B. Sodium Fluoride in varnish form, C. Stannous Fluoride, D. Sodium Fluoride 2%
B: Sodium Fluoride in varnish form
Answer: B: Sodium Fluoride in varnish form 
Explanation: None