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: Pathology
[{'content': 'Which of the following is not antioxidant? \nSelect and explain. \nA. Superoxide dismutase, B. Catalase, C. Coagulase, D. Glutathione peroxidase', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Superoxide dismutase,\xa0Glutathione peroxidase, catalase are the key enzymatic antioxidants by which free radicals that are produced during metabolic reactions are removed.', 'role': 'assistant'}]