This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: TCA Cycle, Subject name: Biochemistry
[{'content': 'Total number of dehydrogenases in Krebs cycle \nSelect and explain. \nA. 3, B. 2, C. 4, D. 5', 'role': 'user'}, {'content': "Answer: C \nExplanation: There are total 4 dehydrogenases present in kreb's cycle: 1. Isocitrate dehydrogenase 2. a- Ketoglutarate dehydrogenase complex 3. Succinate dehydrogenase 4. Malate dehydrogenase", 'role': 'assistant'}]