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': 'Wear and tear pigment in the body refers to \nSelect and explain. \nA. Lipochrome, B. Melanin, C. Anthracotic pigment, D. Haemosiderin', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Lipofuscin, or "wear-and-tear pigment," is an insoluble brownish-yellow granular intracellular material that accumulates in a variety of tissues (paicularly the hea, liver, and brain) as a function of age or atrophy.Lipofuscin represents complexes of lipid and protein that derive from the free radical-catalyzed peroxidation of polyunsaturated lipids of subcellular membranes. It is not injurious to the cell but is a marker of past free radical injury.( Robbins Basic Pathology, 9th edition, page 24 )', 'role': 'assistant'}]