Assertion: multiple sclerosis | /r/HasProperty | chronic disease
Facets:
Source sentences:
text: Multiple sclerosis is a chronic disease that affects the central nervous system, especially the brain, spinal cord, and optic nerves.
text: Multiple sclerosis (MS) is a chronic disease affecting the central nervous system (the brain and spinal cord).MS occurs when the immune system attacks nerve fibers and myelin sheathing (a fatty substance which surrounds/insulates healthy nerve fibers) in the brain and spinal cord.