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
Dental caries is associated with flouride levels in water below: 
Select and explain. 
A. 0.1 mg, B. 0.5 mg /L., C. 1.0 mg /L, D. 2.0 mg /L
C: 1.0 mg /L
Answer: C: 1.0 mg /L 
Explanation: None