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: C i.e. Cyanide', 'role': 'assistant'}]