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': 'Hemosiderin contains \nSelect and explain. \nA. Calcium, B. Magnesium, C. None, D. Iron', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Hemosiderin\n\xa0It is hemoglobin derived, golden yellow to brown, granular or crystalline pigment in which form iron is stored in cells.\nWhen there is local or systemic excess of iron, ferritin forms hemosiderin granules.\nThus hemosiderin pigment represents aggregrates of ferritin micelles.\nUnder normal conditions small amounts of hemosiderin can be seen in the mononuclear phagocytes of the bone marrow,\nspleen and liver, all actively engaged in red cell breakdown', 'role': 'assistant'}]