<prompt> Selenium is a cofactor in the following enzyme:Glutathione peroxidaseCytochrome oxidaseCytochrome reductaseXanthine oxidase  <response>: Ans. A. Glutathione peroxidaseRef: Harper 31e page 534SeleniumCofactors for Glutathione peroxidase Deiodinase Thioredoxin reductase Antioxidant along with vitamin E 