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': 'An enzyme that protects the brain from free radical injury is - \nSelect and explain. \nA. Myeloperoxidase, B. MAO, C. Superoxide dismutase, D. Hydroxylase', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]