<prompt> Which of the following is not an antioxidant?SODVitamin AGluthione peroxidaseXanthine oxidase  <response>: Antioxidant Vitamin Vitamin E Vitamin C Beta Carotene selenium Metabolic antioxidants Glutathione: Reduced glutathione GSH plays a key role in the biological antioxidant enzyme system others: Ceruloplasmin, Transferrin, Albumin, Bilirubin, Haptoglobin enzymatic antioxidants superoxide dismutase, catalase ref satyanarayana 4th ed page 661 