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': 'For controlling an outbreak of cholera, all of the following measures are recommended except ? \nSelect and explain. \nA. Mass chemoprophylaxis, B. Proper disposal of excreta, C. Chlorination of water, D. Early detection and management of cases', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Mass chemoprophylaxis o Mass chemoprophylaxis is not advised for the total community because in order to prevent one serious case of cholera, some 10,000 persons must be given the drug. o Fuher, the drug's effect is only sho-lived for a few days. o Whenever mass chemoprophylaxis was attempted, it failed to stop the spread of cholera. o Because of these reasons, chemoprophylaxis is advised only for household contacts or of a closed community in which cholera has occurred.", 'role': 'assistant'}]