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': 'Man is a definitive host of which parasite ? \nSelect and explain. \nA. Malaria, B. Filaria, C. Measles, D. All', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' Filaria", 'role': 'assistant'}]