In malaria control, insecticide used for insectiside treated bed nets (ITBN)-
Deltamethrin
Malathion
Lindone
Fenitrothion
Ans. is 'a' i.e., Deltamethrin Insecticide Treated Bed Nets (ITBN) Programme (esp. deltamethrin) has resulted in significant decline in malaria incidence and API Average decline in anopheline mosquito density - 68% Average decline in cuicine mosquito density - 50% Chemicals used in ITBN Programme : Synthetic pyretheroids Deltamethrin : 2.5% in dosage of 25 mg/m2 Cyfluthrin: 5% in dosage of 50 mg/m2 Other insecticides used : Permethrin, Lambdacyhalothrin, Etofenprox, Cypermethrin Effectiveness of pyrethroids: For 6-12 months (Retreatment every 6 months) Long-lasting insecticidal mosquito nets (LLINs) : Also use pyrethroid insecticides, and a chemical binder that allows the nets to be washed > 20 times, allowing use for > 3 years.