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
Level of Hardness if the value is 50-150 mg/L ? 
Select and explain. 
A. Soft water, B. Moderately hard water, C. Hard water, D. Very hard water
B: Moderately hard water
Answer: B: Moderately hard water 
Explanation: Ans. is 'b' i.e., Moterately hard water