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': 'Which of the following enzyme is affected by cyanide poisoning? \nSelect and explain. \nA. G-6-P dehydrogenase deficiency, B. Isomerase, C. Cytochrome oxidase, D. None of the above', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Cyanide is a chemical asphyxiant; binding to cellular cytochrome oxidase, it blocks the aerobic utilization of oxygen. Unbound cyanide is detoxified by metabolism to thiocyanate, a much less toxic compound that is excreted in the urine. Ref: Blanc P.D. (2012). Chapter 57. Cyanide. In K.R. Olson (Ed), Poisoning & Drug Overdose, 6e.', 'role': 'assistant'}]