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': 'Electrons in electron transpo chain travel from: \nSelect and explain. \nA. One way irrespective of the potential, B. Low to high potential, C. Two way, D. High to low potential', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Electrons in electron transpo chain travel from low redox potential to high redox potential. Redox potential is the tendency to gain electrons. In ETC, NADH has minimum R.P. (a Strong Electron Donor) and oxygen(O2)has maximum R.P. (a Strong Electron Acceptor).', 'role': 'assistant'}]