This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Diphtheria, Subject name: Social & Preventive Medicine
[{'content': 'In recent surveillance reports cases of diphtheria are reducing. This is due to - \nSelect and explain. \nA. Chemoprophylaxis, B. Improved standard of living, C. Vaccination, D. Health education', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is 'c' i.e., Vaccination o The reduced incidence of diphtheria in India is primarily due to the high coverage of appropriate immunization in children and to an apparent reduction in toxin-producing strains of the bacterium.", 'role': 'assistant'}]