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': 'Tetracycline is used in prophylaxis of which of the following diseases? \nSelect and explain. \nA. Cholera, B. Brucellosis, C. Leptospirosis, D. Meningitis', 'role': 'user'}, {'content': "Answer: A \nExplanation: Tetracycline is the drug of choice for chemoprophylaxis of cholera. Ref: Preventive and Social Medicine, by K.Park, 19th edition, Page 106, 193, 194, 141, 142; Harrison's Internal Medicine, 16th edition, Page 917, 991.", 'role': 'assistant'}]