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
[{'content': 'Which of the following is considered an adequate water supply/head/day - \nSelect and explain. \nA. 50-1501, B. 150-200L, C. 200-250L, D. 100-150L', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., 150-200 litres", 'role': 'assistant'}]