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': 'Diagnosis of CO poisoning post-moem - \nSelect and explain. \nA. Blood thin and red coloured, B. Congestion of all organs, C. Cyanosis, D. Blister on skin', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Autopsy findings cherry red discoloration of skin,mucous membrane,nail bed blood is fluid fine froth in mouth and nose congestion of lungs,pulmonary edema hemorrhages in meninges and cox Features of asphyxia REF;THE SYNOPSIS OF FORENSIC MEDICINE:KS NARAYANA REDDY;28th EDITION;PAGE NO 360', 'role': 'assistant'}]