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': 'Glutathione requires which vitamin to act as antioxidant ? \nSelect and explain. \nA. Vitamin E, B. Niacin, C. Vitamin C, D. Vitamin A', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Niacin", 'role': 'assistant'}]