This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Death and postmortem changes, Subject name: Forensic Medicine
Fat mesentery is sent for investigation in which poisoning - 
Select and explain. 
A. Carbon monoxide, B. Organophosphorus, C. Arsenic, D. Lead
B: Organophosphorus
Answer: B: Organophosphorus 
Explanation: Fat mesentery is preserved in OP poisoning. Dr. Narayana Reddys Synopsis of Forensic Medicine & Toxicology 27 th edition pg. 61.