26.下列何者為維生素B群的缺乏症?(A)山羊營養性肌肉萎縮病(Nutritional myodegeneration)(B)猪隻出現鹅步(goose-stepping gait)(C)雞的黑舌病(Black tongue )(D)雞的捲趾性癱瘓(curled toe)