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': 'Infective stage of hook worm is: \nSelect and explain. \nA. Trophozoite form, B. Filiform larva, C. Cyst, D. None', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. b. Filiform larva', 'role': 'assistant'}]