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
Maximurn permitted level of fluoride in drinking water is meq/L: 
Select and explain. 
A. 0.5, B. 0.8, C. 1, D. 1.5
C: 1
Answer: C: 1 
Explanation: 1