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
[{'content': 'Which is not an aryl phosphate - \nSelect and explain. \nA. Parathion, B. TIK-20, C. Malathion, D. Paraoxon', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Organophosphate poisoning is the most common poisoning in India followed by aluminium phosphide. Organophosphorus compounds are classified as 1. Alkyl compounds -- such as tetraethyl pyrophosphate (TEPP), hexa ethyl tetraphosphate (HETP), octa methyl pyrophosphate (OMPA), malathion etc. 2. Aryl compounds -- such as parathion, chlorothion, diazinon (Tik-20), paraoxon etc. REF;THE SYNOPSIS OF FORENSIC MEDICINE:KS NARAYANA REDDY;28th EDITION;PAGE NO 291', 'role': 'assistant'}]