This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Measles, Subject name: Social & Preventive Medicine
[{'content': 'Carriers are important source of infection in all, EXCEPT: \nSelect and explain. \nA. Measles, B. Mumps, C. Diphtheria, D. Typhoid', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e. Measles Sources of infection :Measles : The only source of infection is a case of measles.Mumps : Both clinical and sub clinical casesDiptheria : 95% carriers and 5% clinical casesTyphoid : case & carriers", 'role': 'assistant'}]