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 known as wear and tear pigment? \nSelect and explain. \nA. Lipochrome, B. Cytochrome, C. Lipoxin, D. Lipoprotein', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Lipofuscin is known as lipochrome. It is wear and tear pigment / aging pigment. It is a sure sign of free radical injury.', 'role': 'assistant'}]