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
If hardness level of water is 50-150 mg/L, the water is defined as - 
Select and explain. 
A. Soft, B. Moderately hard, C. Flard, D. Very hard
B: Moderately hard
Answer: B: Moderately hard 
Explanation: Ans. is 'b' i.e., Moderately hard 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)