This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Epidemiology, Subject name: Social & Preventive Medicine
Disease elimination is helped by 
Select and explain. 
A. Herd immunity, B. Isolation, C. Quarantine, D. None
A: Herd immunity
Answer: A: Herd immunity 
Explanation: If herd immunity is sufficiently high and it's level is maintained and stepped up by an ongoing immunization programme to the point where the susceptible persons are reduced to a small propoion of population it may lead to the elimination of disease in due course. Ref: 25th edition, Park's Textbook of Preventive and Social Medicine, Page no. 111