This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nutrition & Digestion, Subject name: Biochemistry
[{'content': 'Selenium is a cofactor in the following enzyme: \nSelect and explain. \nA. Glutathione peroxidase, B. Cytochrome oxidase, C. Cytochrome reductase, D. Xanthine oxidase', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. A. Glutathione peroxidase(Ref: Harper 31/e page 534)SeleniumCofactors for* Glutathione peroxidase* Deiodinase* Thioredoxin reductase* Antioxidant along with vitamin E', 'role': 'assistant'}]