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: Social & Preventive Medicine
The recommended level of fluorides in drinking water in this Country is accepted as 
Select and explain. 
A. 0.5 to 0.8 mg per litre, B. 1 to 2 mg per litre, C. 3 to 6 mg per litre, D. 7 to 12 mg per litre
A: 0.5 to 0.8 mg per litre
Answer: A: 0.5 to 0.8 mg per litre 
Explanation: None