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: Surgery
[{'content': 'Oxidative phosphorylation couples generation of ATP with which of the following? \nSelect and explain. \nA. Proton translocation, B. Substrate level phosphorylation, C. Electron flow through cytochromes, D. None of the above', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Proton translocation across the mitochondrial membrane generates an electrochemical potential difference composed of a pH gradient and an electrical potential. This electrochemical potential difference is used to drive ATP synthase to form ATP.', 'role': 'assistant'}]