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': 'Due to epidemiological reasons chemoprophylaxis is most impractical in the control of \nSelect and explain. \nA. Tuberculosis, B. Cholera, C. Diphtheria, D. Measles', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]