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': 'Molybdenum is present in which enzyme ? \nSelect and explain. \nA. Cytochrome oxidase, B. Xanthine oxidase, C. Glutathione peroxidase, D. Urease', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans:B.)Xanthine Oxidase.Molybdenum containing enzymes include: xanthine oxidase and closely related enzymes (the molybdenum-containing hydroxylases), sulphite oxidase and nitrate reductase.', 'role': 'assistant'}]