100. 多處髓鞘脫失 (demyelination)但軸索相對無恙的是:(A)中央橋腦髓燐脂溶解(central pontine myelinolysis)(B)肌萎縮性側索硬化(amyotrophic lateral sclerosis)(C)多發性硬化(multiple sclerosis)(D)脊髓亞急性合併變性(subacute combined sclerosis)