This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Social & Preventive Medicine
Quantity of water available per capita considered adequate to meet the needs of all urban domestic purposes? 
Select and explain. 
A. 100-150 L, B. 150-200 L, C. 200-250 L, D. 250-300 L
B: 150-200 L
Answer: B: 150-200 L 
Explanation: 2 L is the amount of water required for meeting the physiological requirements of the body everyday. But water is also required for many other activities of daily life such as cooking, washing, bathing etc. Taking this into consideration, 150-200 L of water per capita is the amount considered adequate to meet the needs of all urban domestic purposes. Ref: Park's Textbook of Preventive and Social Medicine, 20th edition, p617