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': 'Which of the following is associated with ependy¬mal cells rather than microglial cells? \nSelect and explain. \nA. Blepharoplasts, B. Rod cells, C. Gitter cells, D. Reservoir for HIV', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ependymal cells line the cerebral ventricles and have blepharoplasts that are visible with special stains. They are useful histologic markers that document the epen\xaddymal origin of a brain tumor. Microglial cells are derived from macrophages and are the phagocytic cells of the central nervous system. When activated, microg\xadlial cells are called gitter cells and have a foamy appear\xadance. Neuronophagia (e.g., viral encephalitis, poliomy\xadelitis) occurs when microglial cells phagocytize breakdown products of the neuron. Rod-like microg\xadlial cells are seen in neurosyphilis. Macrophages are primarily responsible for carrying HIV into the central nervous system and are the reservoir cell for the virus.', 'role': 'assistant'}]