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
Propagative? 
Select and explain. 
A. Plague, B. Filaria, C. Malaria, D. All
A: Plague
Answer: A: Plague 
Explanation: 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.