This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Poisoning, Subject name: Forensic Medicine
Not an Organophosphate 
Select and explain. 
A. Diazinon, B. Endrin, C. Malathion, D. Parathion
B: Endrin
Answer: B: Endrin 
Explanation: Endrin is an organochloride with the chemical formula C12H8Cl6O. It was primarily used as an insecticide, as well as a rodenticide and pesticide. Commonly used organophosphates are Parathion Malathion Methyl parathion Chlorpyrifos Diazinon Dichlorvos Phosmet Fenitrothion Tetrachlorvinphos Azamethiphos Azinphos-methyl Ref - Krishnan Vij 5th edition pg 532