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
\r\n\r\n\r\n \r\nWhat should be the hardness level of drinking water?\r\n\r\n 
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: Drinking water should be moderately soft. Softening of water is recommended when hardness exceeds 3 meq/ L. Ref: Park 21st edition page: 672.