This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Endocrinology, Subject name: Pathology
Multiple sclerosis affects 
Select and explain. 
A. White matter, B. Gray matter, C. Both, D. None
A: White matter
Answer: A: White matter 
Explanation: Multiple sclerosis is an autoimmune demylinating disease characterised by distinct episodes of neurological deficits, attributable to white matter lesions. Common early signs of multiple sclerosis (MS) include: vision problems. tingling and numbness. pains and spasms. weakness or fatigue. balance problems or dizziness. bladder issues. sexual dysfunction. cognitive problems. Robbins basic pathology. 7th edition . Chapter: the central nervous system. Pge no. 1382.