Select the statement that correctly describes multiple sclerosis.

Multiple sclerosis is a chronic disease in which the immune system damages myelin in the central nervous system—the brain and spinal cord. It can cause a range of neurological symptoms, but severe progressive memory loss is not its defining feature, and it is generally not considered fatal. Therefore, the correct statement is that this nonfatal disease disrupts the CNS.

AI-written and checked against the verified answer.