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: Unknown
[{'content': 'In the central nervous system (CNS), oligoden¬drocytes share a similar function with \nSelect and explain. \nA. Gemistocytes, B. Astrocytes, C. Schwann cells, D. Microglial cells', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Oligodendrocytes in the central nervous system (CNS) share a similar function with Schwann cells in the peripheral nervous system-synthesis of myelin. Oli\xadgodendrocytes are small, round, lymphocyte-size cells that produce and maintain CNS myelin, which is primarily located in the white matter. Certain diseases, such as progressive multifocal leukoencephalopathy, caused by a papovavirus, specifically attack oligoden\xaddrocytes and produce demyelination. Oligodendrogli\xadomas are malignant tumors that are derived from oligo\xaddendrocytes. However, unlike Schwann cells, oligodendrocytes contribute segments of myelin sheaths to more than one axon.\nGemistocytes are reactive astrocytes that have an eosinophilic cytoplasm. They are commonly seen along the periphery of cerebral infarctions. Some astro\xadcytomas have a gemistocytic appearance.\nAstrocytes provide the structural framework for the neurons and are analogous to the fibroblasts in connec\xadtive tissue. However, scarring in the brain is not associ\xadated with collagen synthesis but with filling in the defect with the cellular processes of astrocytes. A cere\xadbral abscess is the only example of CNS repair with collagen, which is derived from the blood vessels.\nMicroglial cells are derived from monocytes. They are the phagocytic cell of the CNS.\nEpendymal cells line the ventricles of the brain and the spinal canal. They do not produce CSF nor are they responsible for reabsorption of CSF, a function relegated to arachnoid cells.', 'role': 'assistant'}]