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': 'Which of the following is not an antioxidant \nSelect and explain. \nA. Beta carotene, B. Vit C, C. Vit E, D. Vit B1', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Antioxidant vitamins are beta carotene, vitamin A, vitamin C and vitamin E.', 'role': 'assistant'}]