This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Lipids, Subject name: Biochemistry
[{'content': 'Lipid peroxidation as a part of ageing and injury of cells is: \nSelect and explain. \nA. Free radical theory, B. Apoptosis theory, C. Enzyme cascade theory, D. Cell destruction theory', 'role': 'user'}, {'content': 'Answer: A \nExplanation: A', 'role': 'assistant'}]