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
Moderately hard water has hardness level - 
Select and explain. 
A. < 1, B. 3-Jan, C. 6-Mar, D. >6
B: 3-Jan
Answer: B: 3-Jan 
Explanation: Ans. is 'b' i.e., 1-3 Classification of hardness in waterClassificationLevel of hardness (mEq./litre)a) Soft waterb) Moderately hardc) Hard waterd) Very hard waterLess than 1 (< 50 mg/L)1 -3 (50- 150 mg/L)3 -6(150-300 mg/L)Over 6 (> 300 mg/L)