This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Toxicology - 2, Subject name: Forensic Medicine
All are Aryl phosphate group of Organophosphorus compounds except: 
Select and explain. 
A. Follidol, B. Malathion, C. Diazinon, D. Parathion
B: Malathion
Answer: B: Malathion 
Explanation: Alkyl phosphates : HETP, TEPP, OMPA, isopestox ,Malathion , Sulfotepp , Trichlorfon Aryl phosphates : Parathion , Methyl parathion , Chlohion , Paraoxon, Diazinon