This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General physiology, Subject name: Physiology
[{'content': 'All are markers of mitochondria except \nSelect and explain. \nA. ATP synthase, B. 5-nucleotidase, C. Glutamate dehydrogenase, D. Creatine kinase', 'role': 'user'}, {'content': 'Answer: B \nExplanation: 5-nucleotidase is a marker in the mitochondria It cleaves 5 - nucleotides Ref:Guyton and Hall textbook of medical physiology 12th edition ,pag number: 20,21,22', 'role': 'assistant'}]