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
Organophosphate insecticides are all except – a)  Dieldrinb)  Fenthion c)  Diazinond)  Propoxure)  Lindane 
Select and explain. 
A. acd, B. bde, C. ade, D. ad
C: ade
Answer: C: ade 
Explanation: Organo-phosphorus Insecticides:
– Malathion – Parathion
– Fenthion – Diazinon
– Fenitrothion – Chlorpyrifos
– Dioxathion – Chlorthion
Organo-chlorine Insecticides:
– DDT – BHC (HCH)
– Lindane – Dieldrin
Carbamate Insecticides:
– Carbaryl – Propoxur