True regarding galactosemia: (A) Mental retardation occurs, (B) Defect in epimerase, (C) Defect in galactose 1PO4 uridyl transferase, (D) All the above
Answer is D. Inability to metabolise galactose occurs in galactosemia which may be caused by deficiency of galactose-1-phosphate uridyl transferase,UDP-Galactose-4-Epirnerase and galactokinase.
Out of three, most common is Galactose =1-phosphate uridyl transferase deficiency.