This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Biochemistry
[{'content': 'The mineral having sparing action on vitamin E \nSelect and explain. \nA. Calcium, B. Iron, C. Iodine, D. Selenium', 'role': 'user'}, {'content': 'Answer: D \nExplanation: The element selenium\xa0 is found in the enzyme glutathione\xa0 peroxidase\xa0 that\xa0 destroys\xa0 free radicals.\xa0 Thus, Se is also involved\xa0 in antioxidant functions like vitamin E, and both of them act synergistically.\xa0 To a certain extent, Se can spare the requirement\xa0 vitamin E, and vice versa.\nRef : Satyanarayana, 3rd ed, pg. 129', 'role': 'assistant'}]