Biochemistry Classic Galactosemia is due to deficiency of: A Hexosaminidase B Glucocerebroside C Sphingomyelinase D Galactose-1-Phosphate-Uridyl-Transferase 💡 Explanation Classic Galactosemia is due to deficiency of: ✓ Correct Answer: D. Galactose-1-Phosphate-Uridyl-Transferase