This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Haematology, Subject name: Pathology
[{'content': 'Iron is stored in- \nSelect and explain. \nA. Bone marrow, B. Liver, C. Spleen, D. All of the above', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Free iron is highly toxic and it is therefore impoant that storage iron be sequestered. This is achieved by binding of iron in the storage pool to either ferritin or hemosiderin.Ferritin is ubiquitous protein iron complex that is found at highest level in liver,spleen ,bonemarrow and skeletal muscles. In the liver ferritin is stored within the parenchymal cells and in other tissues such as spleen and the bonemarrow it ix found mainly in the macrophages. Ref: Robbins and Cotran Pathologic basis of disease.South Asia Edition -9;volume 1.page no . 420', 'role': 'assistant'}]