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 minimum amount of fluoride that should be present in salt for effective anticaries activity in: 
Select and explain. 
A. 3mg of F/5gm of salt, B. 1.5mg of F/5gm of salt, C. 10mg of F/5gm of salt, D. 100mg of F/5gm of salt
B: 1.5mg of F/5gm of salt
Answer: B: 1.5mg of F/5gm of salt 
Explanation: None