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': 'Lipid peroxidation in cells exposed to ionizing radiation is initiated by \nSelect and explain. \nA. Catalase, B. Superoxide, C. Hydroxyl Radical, D. Glutathione', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Radiolysis of water leads to formation of hydroxyl radicals that initiate lipid peroxidation of membrane phospholipids.', 'role': 'assistant'}]