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: Unknown
Recommended level of fluoride in drinking water- 
Select and explain. 
A. 0.2-0.5 mg/L, B. 0.5-0.8 mg/L, C. 0.8-1.2 mg/L, D. 1.2-2.0 mg/L
B: 0.5-0.8 mg/L
Answer: B: 0.5-0.8 mg/L 
Explanation: Ans, is 'b' i.e., 0[?]5 - 0[?]8 mg/L o The recommended level of fluoride in drinking water in the country is accepted as 0-5 to 0-8 mg.; Liter. -Park o The maximum permissible limit is T5 mg/L it.