This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Respiratory chain, Subject name: Biochemistry
[{'content': 'All the following inhibit complex IV and totally arrest respiration except \nSelect and explain. \nA. H2S, B. Carbon monoxide, C. Cyanide, D. Dimercaprol', 'role': 'user'}, {'content': 'Answer: D \nExplanation: The classic poisons H2S, carbon monoxide, and cyanide inhibit Complex IV and can therefore totally arrest respiration. Reference: Harper; 30th edition; Page no: 132', 'role': 'assistant'}]