<prompt> Which of the following vitamin is most potent antioxidant?Vitamin DVitamin EVitamin KVitamin B  <response>: Ans. B Vitamin E Vitamins which act as anti-oxidants are: Vitamin A, C and E tocopherol Beta Carotene Vit A is an anti-oxidant at low PO2 These antioxidants are of two types:1. Preventive antioxidants: Reduce the rate of chain initiation. Includes: Catalase, EDTA, DTPA2. Chain breaking antioxidant: Interfere with chain propagation. Includes: SOD, Vitamin E. 