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
Which of the following is considered an adequate water supply/head/day - 
Select and explain. 
A. 50-1501, B. 150-200L, C. 200-250L, D. 100-150L
B: 150-200L
Answer: B: 150-200L 
Explanation: Ans. is 'b' i.e., 150-200 litres