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': 'Cherry red hypostasis is seen in - \nSelect and explain. \nA. Dhatura poisoning, B. Cyanide poisoning, C. Carbon monoxide poisoning, D. Aniline poisoning', 'role': 'user'}, {'content': "Answer: C \nExplanation: CO affinity to myoglobin is about 40 times greater than oxygen & affinity to haemoglobin is 200-300 times greater. It acts as a chemical asphyxiant by reducing the oxygen carrying capacity of blood and produces death due to anaemic anoxia. POSTMOEM CHANGES A cherry red coloration of skin,mucus membranes, conjunctiva,nail beds, areas of hypostasis, blood ,tissue and internal organs is seen in 15-20% cases It is associated with 30-40% COHb This cherry red discolouration changes to dark green and then to brown. Ref: K.S.Narayan Reddy's Synopsis of Forensic Medicine and Toxicology, 29th edition, Chapter 35, page- 347.", 'role': 'assistant'}]