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
4 yr old child has 0.2 ppm fluoride in drinking water. The child can be administered: 
Select and explain. 
A. 1 mg tab/day, B. Rinses 0.2% NaF, C. Topical application of fluoride, D. Fluoride containing dentifrices
A: 1 mg tab/day
Answer: A: 1 mg tab/day 
Explanation: None