This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General pathology, Subject name: Pathology
[{'content': 'All of the following are free radical scavengers except \nSelect and explain. \nA. Superoxide dismutase, B. Glutathione peroxidase, C. Catalase, D. Hydrogen peroxide', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Cells have developed many mechanisms to remove free radicals and thereby minimize injury Antioxidant enzymes include glutathione peroxidase, SOD and catalase. Hydrogen peroxide is one of the free radical involved in causing injury Reference: Robbins and Cotran Pathologic Basis of Disease, page 48, 9th edition; Chapter 2', 'role': 'assistant'}]