Multiple sclerosis (MS) is a chronic illness involving the central nervous system where the immune system attacks the protective covering of nerves, leading to diminished function in the brain and spinal cord. How does MS progress in its early stages?

• A. It primarily causes digestive issues.
• B. It leads to immediate severe paralysis.
• C. It starts with vision problems and muscle weakness.
• D. It affects the heart and lung function first.

Answer: (C)