This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: ETC, Subject name: Biochemistry
[{'content': 'Arrange the components of ETC used in sequence when ETC stas from FADH2: A. ATP synthase B. Cytochrome c Reductase C. Succinate dehydrogenase D. Cytochrome c oxidase \nSelect and explain. \nA. A - D- B- C, B. C - B- D- A, C. C - D- A-B, D. D - B- A- C', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Components of Electron Transpo Chain', 'role': 'assistant'}]