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': 'Cyanide poisoning causes: AFMC 10 \nSelect and explain. \nA. Histotoxic anoxia, B. Anoxic anoxia, C. Anemic anoxia, D. Stagnant anoxia', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. Histotoxic anoxia', 'role': 'assistant'}]