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 associated with aging \nSelect and explain. \nA. Reduced cross linkages in collagen, B. Increased free radical injury, C. Somatic mutations in DNA, D. Increased superoxide dismutase levels', 'role': 'user'}, {'content': 'Answer: B \nExplanation: . Increased free radical injury', 'role': 'assistant'}]