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
Insecticide treated Bed nets (ITBN) are treated with:- 
Select and explain. 
A. Deltamethrin and Cyfluthrin, B. Diethyltoulamide, C. Pyrethrum, D. Malathion
A: Deltamethrin and Cyfluthrin
Answer: A: Deltamethrin and Cyfluthrin 
Explanation: 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.