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: Unknown
[{'content': 'Which of these enzymes does not play a role in the generation of proton gradient during electron transport? \nSelect and explain. \nA. NADH oxidase, B. Succinate CoQdehydrogenase, C. Cytochromeoxidase, D. Cytochromeb-c1', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ref:\xa0 \xa0 Harper’s ‘Illustrated Biochemistry’; 27/e, pg103', 'role': 'assistant'}]