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 Krebs cycle ? \nSelect and explain. \nA. 3, B. 2, C. 4, D. 5', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is 'c' i.e., 4", 'role': 'assistant'}]