This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Social & Preventive Medicine
[{'content': 'Under Insecticide Treated Bed Nets Program me, insecticide used is - \nSelect and explain. \nA. Deltamethrin, B. Malathion, C. Lindone, D. Fenitrothion', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Inseccide Treated Bed Nets (ITBN) Programme (esp. deltamethrin) has resulted in significant decline in malaria incidence and API\n\nAverage decline in anopheline mosquito density - 68%\nAverage decline in cuicine mosquito density - 50%\n\nChemicals used in ITBN Programme : Synthec pyretheroids\n\nDeltamethrin : 2.5% in dosage of 25 mg/m2\nCyfluthrin: 5% in dosage of 50 mg/m2\nOther inseccides used : Permethrin, Lambdacyhalothrin, Etofenprox, Cypermethrin\n\nEffecveness of pyrethroids: For 6-12 months (Retreatment every 6 months)\nLong-lasng inseccidal mosquito nets (LLINs) : Also use pyrethroid inseccides, and a chemical binder that allows the nets to be washed > 20 mes, allowing use for > 3 years.', 'role': 'assistant'}]