45. 下列哪個神經疾病主要是影響髓鞘?(A)庫賈氏症(Creutzfeldt-Jakob Disease)(C)亨丁頓舞蹈症(Huntington's Disease)(B)巴金森氏症(Parkinson's disease)(D)威爾森氏症(Wilson's disease)(E)多發性硬化症(multiple sclerosis)