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
Not a synthetic pyrethroid insectiside 
Select and explain. 
A. Propoxur, B. Permethrin, C. Cypermethrin, D. Etofenoprox
A: Propoxur
Answer: A: Propoxur 
Explanation: Ans. is 'a' i.e., PropoxurInectisides are divided into :Fumigants : Hydrogen cyanide, SO2, methyl bromide, carbon disulphate.Stomach poisons : Paris green, Sodium fluoride.Contact (nerve) poisons : These are divided into Natural : Pyrethrum, rotenone, Derris, nicotine, mineral oil.Synthetic : These are -Organophosphates : Malathion, parathion, fenthion, diazinon, fenitrothion, abate, chlohion, dioxathion, chlorpyrifos, trichlorfon.Carbamates : Carbaryl, propoxur, dimetilan, pyrolon.Organochlorine : DDT, BHC (HCH), dieldrin, aldrin, chlordane, lindane, heptachlor.Synthetic pyrethroid (pyrethrum derivatives) : Pothrin, resmethrin, permethrin, biopermethrin, cypermethrin, cyphenothrin, cycloprothrin, deltamethrin, cyfluthrin, etofenoprox