This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Entomology, Subject name: Social & Preventive Medicine
[{'content': 'Which stage of larva of housefly is voracious feeder - \nSelect and explain. \nA. 1, B. 2, C. 3, D. 4', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., 1 o The larva of housefly (maggot) moults twice, i.e. there are three instar stages,o The first instar larva is a varacious feeder, feeding mainly on decomposing liquid organic matter.", 'role': 'assistant'}]