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': 'All of the following are larva control measures except - \nSelect and explain. \nA. Gambusia, B. Intermittent irrigation, C. DDT, D. Paris green', 'role': 'user'}, {'content': "Answer: C \nExplanation: Antilarval measures of mosquito control are: Environmental control - Source reduction and minor engineering methods like filling, levelling and drainage of breeding places and water management(like intermittent irrigation) Chemical control -Mineral oils, Paris green, synthetic insecticides Biological control with gambusia and lebister which feed on larvae of mosquitos. Park's Textbook of Preventive and Social Medicine, 25th Edition, Pg 832", 'role': 'assistant'}]