This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Medical Entomology, Subject name: Social & Preventive Medicine
Organophosphate insecticides are all except: 
Select and explain. 
A. Dieldrin, B. Fenthion, C. Diazinon, D. Chlorpyrifos
A: Dieldrin
Answer: A: Dieldrin 
Explanation: Organo phosphorous insecticides Malathion Parathion Fenthion Diazion Fenitrothion Chlorpyrifos Dioxathion Chlohion Organo chlorine insecticides DDT BHC (HCH) Lindane Dieldrin Carbamate insecticides Carbaryl Propoxur