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 of the following is not a rate limiting enzyme of TCA cycle? \nSelect and explain. \nA. Citrate synthase, B. Alpha ketoglutarate dehydrogenase, C. Isocitrate dehydrogenase, D. Succinate dehydrogenase', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Option a,b,c are the rate limiting enzymes of TCA cycle.', 'role': 'assistant'}]