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': "Total number of dehydrogenases in Kreb's cycle \nSelect and explain. \nA. 3, B. 2, C. 4, D. 5", 'role': 'user'}, {'content': 'Answer: C \nExplanation: There are 4 dehydrogenase in TCA cycle :-\n\n(i) Isocitrate dehydrogenase, (ii) α -ketoglutarate dehydrogenase, (iii) Succinate dehydrogenase, (iv) Malate\ndehydrogenase.', 'role': 'assistant'}]