This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Social & Preventive Medicine
[{'content': 'The biological transmission of filariasis is an example of: \nSelect and explain. \nA. Propagative transmission, B. Cyclical transmission, C. Cyclo-developmental transmission, D. Cyclo-Propagative transmission', 'role': 'user'}, {'content': "Answer: C \nExplanation: Biological transmission is of three types: Propagative: The agent merely multiplies in vector, but no change in form. e.g. plague bacilli in rat fleas Cyclo-Propagative: The agent changes in form and number. e.g. malaria parasites in mosquito Cyclo-developmental: The disease agent undergoes only development but no multiplication. e.g. microfilaria in mosquito. REMEMBER: Transovarial transmission: When the infectious agent is transmitted veically from the infected female to her progeny in the vector. e.g. dengue Ref: Park's textbook of Preventive and Social Medicine, 21st edition, page-93", 'role': 'assistant'}]