You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is It is a type of nerve cell that protects CNS from infection and become phagocytic in response to inflammation and explain in detail?
C: Microglia helps remove bacteria and cell debris from the CNS.
A: Schwann cells form myelin sheaths around axons, or enclose unmyelinated axons in the peripheral nervous system.
B: Ependymal cells line ventricles of the brain, circulate cerebrospinal fluid; some form choroid plexuses, which produce CSF.
D: Astrocytes serves as the major supporting tissue in the CNS and contribute to the blood-brain barrier.