This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Pathology
[{'content': 'Selenium is a cofactor in following enzyme \nSelect and explain. \nA. Glutathione peroxidase, B. Cytochrome oxidase, C. Cytochrome reductase, D. Xanthine oxidase', 'role': 'user'}, {'content': "Answer: A \nExplanation: Selenium21st amino acid = Selenocysteine RDA = 50 - 100 mcg/daySelenium as a co-factorSelenium deficiencySelenium toxicityGlutathione peroxidaseDeiodinase Thioredoxin reductase Keshan's cardiomegaly Kashin-beck disease Peripheral neuropathy Garlic odor to breathDermatitis (Refer: DM Vasudevan, Textbook of Biochemistry, 7th edition, pg no: 523)", 'role': 'assistant'}]