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': 'Phlebotomus argentipes is killed by - \nSelect and explain. \nA. Malathion, B. DDT, C. BHC, D. Pyrethium', 'role': 'user'}, {'content': "Answer: B \nExplanation: Phlebotomus argentipes is sandflies species and it is effectively killed by a single application of DDT1-2gm/sq.meter and it may remain effective for a period of 1 to 2 years. Park's Textbook of Preventive and Social Medicine, 25th Edition, Pg 844", 'role': 'assistant'}]