This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nervous System, Subject name: Physiology
[{'content': 'All are neuroglial cells in CNS EXCEPT \nSelect and explain. \nA. Astrocytes, B. Microglia, C. Oligodendrocytes, D. Troposomes', 'role': 'user'}, {'content': 'Answer: D \nExplanation: (Troposomes) (63 - 64 - Ganong 22nd) (- Ganong 23rd)FUNCTIONS OF NEUROGLIAL CELLSASTROCYTESMICROGLIAOLIGODENDEOCYTES* The astrocytes twist around the nerve cells and form the supporting network in brain and spinal cord* Astrocytes form the basis of BBB and there by regulates the entry of substances* Microglia are phagocytic in functions* Microglia and cellular debris are engulfed and destroyed by the microgliaOligodendrocytes are responsible for the formation of myelin sheath, around the nerve fibres in CNS because Schwann cells are absent there', 'role': 'assistant'}]