This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Helminthology, Subject name: Microbiology
[{'content': 'Incubation period for Nector americanus - \nSelect and explain. \nA. 1 week, B. 2 weeks, C. 3 weeks, D. 5-6 weeks', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans. is \'d\' i.e., 5-6 weeks o Following penetration, N-americanus migrates to the lung within about 10 days.o After 3-5 weaks, it passes through the GIT and attaches to the intestinal mucosa, where it matures into the adult worm and may stay for up to ~ 5 yearso The average period between larva penetration and egg production (prepatent period) is 4-8 weeks."Incubation period is variable, generally GI symptoms can appear 35-40 days after penetration of filiform larva.""The incubation period can vary between a few weeks to many months and largely dependent on the number of hook worm parasites an individual is infected with" - Wikipedia', 'role': 'assistant'}]