This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: NVBDCP, NLEP, Subject name: Social & Preventive Medicine
[{'content': 'Insecticide treated Bed nets (ITBN) are treated with:- \nSelect and explain. \nA. Deltamethrin and Cyfluthrin, B. Diethyltoulamide, C. Pyrethrum, D. Malathion', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Chemicals used in ITBN programme: synthetic pyretheroids. It includes: Deltamethrin: 2.5% in dosage of 25 mg/m. Cyfluthrin: 5% in dosage of 50 mg/m. Other insecticides used: permethrin, Lambdacyhalothrin, Etofenprox, a-cypermethrin. Effectiveness of pyrethroids: for 6-12 months.', 'role': 'assistant'}]