This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Environment and health, Subject name: Social & Preventive Medicine
[{'content': 'Life span of house fly is? \nSelect and explain. \nA. 5 days, B. 10 days, C. 1 month, D. 1 year', 'role': 'user'}, {'content': "Answer: C \nExplanation: The complete life cycle from egg to adult may take 5 to 6 days during summer in India, but at other times it may take 8 to 20 days. Flies do not generally live longer than 15 days in summer and 25 days during winter Eggs - 8 to 24 hours, Larvae - 2 to 7 days, Pupae - 3 to 6 days, Adults 5-20 says. Park's Textbook of Preventive and Social Medicine, 25th Edition, Pg", 'role': 'assistant'}]