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': 'Mechanism of action of cyanide poisoning: September 2010 \nSelect and explain. \nA. Inhibits protein breakdown, B. Inhibits DNA synthesis, C. Inhibits protein syntheisi, D. Blocks Cytochrome enzyme P- 450', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans. D: Blocks Cytochrome enzyme P- 450 Cyanide poisoning occurs when a living organism is exposed to a compound that produces cyanide ions (CN-) when dissolved in water. Common poisonous cyanide compounds include hydrogen cyanide gas and the crystalline solids potassium cyanide and sodium cyanide. The cyanide ion halts cellular respiration by inhibiting an enzyme in mitochondria called cytochrome c oxidase.', 'role': 'assistant'}]