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
[{'content': 'Propagative epidemic, transmission is - \nSelect and explain. \nA. Person to person, B. Animal to person, C. Water to person, D. Fomite to person', 'role': 'user'}, {'content': 'Answer: A \nExplanation: .a propagated epidemic is usually of infectious origin.its mode of transmission is from person to person always.the epidemic usually shows a gradual rise and tails off over a much longer time.transmission continues untill the number of susceptibles depleted.the speed of spread depends upon herd immunity ,oppounities for contact and secondary attacks rates.occur commonly in aggregated populations. ref:park&;s textbook,22 nd ed,pg 63', 'role': 'assistant'}]