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': 'All are antioxidant except ? \nSelect and explain. \nA. Vitamin A, B. Catalase, C. Cystein, D. Glutamine', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is 'd' i.e., Glutamine", 'role': 'assistant'}]