This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Infectious Disease Epidemiology, Subject name: Social & Preventive Medicine
[{'content': 'Disease elimination is helped by- \nSelect and explain. \nA. Herd immunity, B. Isolation, C. Quarantine, D. None', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Herd immunity o If the herd immunity is sufficiently high, the occurrence of an epidemic is regarded as highly unlikely.o If that high level of immunity is maintained and stepped up, by an on-going immunization programme, to the point where the susceptible persons are reduced to a small proportion of the population, it may lead to elimination of the disease in due course.o This has been achieved in such diseases as diphtheria and polio.", 'role': 'assistant'}]