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
A 3-yr-old child living in area with 0.8 ppm F in water should be given F tablets daily: 
Select and explain. 
A. 0.25 mg, B. 1 mg, C. 0.5 mg, D. 0.00 mg
D: 0.00 mg
Answer: D: 0.00 mg 
Explanation: None