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 protonsa) NADH-Q oxidoreductaseb) Cytochrome-C oxidasec) Cytochrome C - Q oxidoreductased) Isocitrate dehydrogenasee) Succinate Q reductase \nSelect and explain. \nA. ac, B. bc, C. ad, D. b', 'role': 'user'}, {'content': "Answer: A \nExplanation: NADH-Q oxidoreductase & 'c' i.e., Cytochrome C - Q oxidoredictase\n\nComplex I (NADH-CoQ reductase) and complex in (CoQ - cytochrome c reductase) pump 4 protons each and complex IV (cytochrome c oxidase) pumps 2 protons.", 'role': 'assistant'}]