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': 'Propagative? \nSelect and explain. \nA. Plague, B. Filaria, C. Malaria, D. All', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a1 i.e.. Plague o Propagative-Plague bacilli in rat fleaso Cyclo-developmental-Micorfllaria in mosquito,o Cyclo-propagative-Malarial parasite in mosquito.", 'role': 'assistant'}]