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': 'Which one of the following insecticides is commonly used for ultra-low volume fogging \nSelect and explain. \nA. Abate, B. DDT, C. Paris green, D. Malathione', 'role': 'user'}, {'content': "Answer: D \nExplanation: Most extensively used insecticides are malathion and fenitrothion for ultralow volume fogging. Park's Textbook of Preventive and Social Medicine, 25th Edition, Pg 833", 'role': 'assistant'}]