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: Forensic Medicine
[{'content': 'Which organophosphate is NOT an aryl phosphate? \nSelect and explain. \nA. Parathion, B. Tik-20, C. Malathion, D. Paraoxon', 'role': 'user'}, {'content': 'Answer: C \nExplanation: All are aryl phosphate except malathion which is a alkyl phosphate. Alkyl phosphates are: HETP TEPP (Tetron) OMPA Dimefox Isopestox Malathion (Kill bug; Bugsolin) Sulfotepp Demeton Trichlorfon Aryl phosphates are: Parathion (nitrostigmine) (Follodol; Kill phos; Ekato) Paraoxon Methyl-parathion (Metacide) Chlohion Diazinon (Diazion; Tik 20) Ref: The essentials of forensic medicine and toxicology by Dr K S Narayan Reddy, 27th edition, Page 457.', 'role': 'assistant'}]