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': 'Which component transfers four protons: \nSelect and explain. \nA. NADH-Q Oxidoreductase, B. Cytochrome -C oxidase, C. Cytochrome C - Q oxidoredictase, D. Isocitrate Dehydrogenase', 'role': 'user'}, {'content': 'Answer: A \nExplanation: A i.e. NADH-Q Oxidoreductase; C i.e. Cytochrome C-Q oxidoreductase', 'role': 'assistant'}]