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': 'During epidemics of cholera, Wells needs to be disinfected every: March 2013 (b, d, e) \nSelect and explain. \nA. Hour, B. Day, C. Week, D. Month', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. B i.e. Day During epidemics of cholera, wells should be disinfected every day', 'role': 'assistant'}]