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: Biochemistry
[{'content': 'The electron flow in cytochrome C oxidase can be blocked by \nSelect and explain. \nA. Rotenone, B. Antimycin-A, C. Cyanide, D. Actinomycin', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Inhibitors of Electron transport chain (Respiratory chain)\n\nComplex I :- Barbiturates (amobarbital), piercidin A, rotenone, chlorpromazine, guanithidine.\nComplex II Carboxin, TTFA, malonate.\nComplex HI Dimercaprol, BAL, actinomycin A, Naphthyloquinone.\nComplex IV (cytochrome c oxidase) :- Carbon monoxide (CO), cyanide (CN),H2S, azide (N3-)', 'role': 'assistant'}]