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: Microbiology
[{'content': 'Vector for Kala-azar - \nSelect and explain. \nA. Flea, B. Tsetse fly, C. Sand fly, D. Tick', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Sandflies of genera Phlebotomus act as intermediate host for Leishmaniasis (Kala-azar).\nHuman and other vertebrates act as definitive host.', 'role': 'assistant'}]