Tay-Sachs disease is characterized by a deficient enzyme and accumulated substrate. What is the deficient enzyme and accumulated substrate, respectively?
a) β-Galactosidase, Ganglioside GM2.
b) Glucocerebrosidase, Glucocerebroside.
c) α-Galactosidase A, Globotriaosylceramide.
d) Hexosaminidase A, Ganglioside GM2.