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
Molybdenum is present in which enzyme ? 
Select and explain. 
A. Cytochrome oxidase, B. Xanthine oxidase, C. Glutathione peroxidase, D. Urease
B: Xanthine oxidase
Answer: B: Xanthine oxidase 
Explanation: Ans:B.)Xanthine Oxidase.Molybdenum containing enzymes include: xanthine oxidase and closely related enzymes (the molybdenum-containing hydroxylases), sulphite oxidase and nitrate reductase.