Multiple choice The mylein sheath gets damaged in Morphea Pityriasis lichenoides et varioliformis acuta Multiple sclerosis Myasthenia gravis Reveal answer Fill a bubble to check yourself C Correct answer Explanation Multiple sclerosis is an inflammatory disease in which the fatty myelin sheaths around the axons of the brain and spinal cord are damaged, leading to demyelination and scarring as well as a broad spectrum of signs and symptoms.