This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Environment and Health, Subject name: Social & Preventive Medicine
Normal fluoride level in water: 
Select and explain. 
A. 2.0 mg/1, B. 0.5 mg/1, C. 1.5 mg/1, D. 2.5 mg/1
B: 0.5 mg/1
Answer: B: 0.5 mg/1 
Explanation: Ref: 21st edition Park, pg 577 & pg 668Explanation:The major source of fluorine to man is drinking water.In most parts of India the fluoride content of drinking water is about 0.5 mg/L.The recommended maximum limit of concentration of fluoride is 1.5 mg/litre.