<prompt> An example of a preventive antioxidant is:CatalaseTocopherolSuperoxide dismutaseUrate  <response>: Antioxidants fall into two classes:Preventive antioxidants, which reduce the rate of chain initiation. ex: Catalase and other peroxidases such as glutathione peroxidase.Chain-breaking antioxidants, which interfere with chain propagation. ex: Superoxide Dismutase, Uric Acid, Vitamin E Most powerful.Key Concept:Catalase falls into preventive anti-oxidants which reduce the rate of chain initiation.Ref : Harpers illustrated biochemistry, 31st edition. 