This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Carbohydrates, Subject name: Biochemistry
Enzyme deficiency in Galactosemia: 
Select and explain. 
A. Galactose 1 phosphate uridyl transferase, B. Aldolase B, C. UDP galactose 4 epimerase, D. Fructokinase
A: Galactose 1 phosphate uridyl transferase
Answer: A: Galactose 1 phosphate uridyl transferase 
Explanation: Ans. A. Galactose 1 Phosphate uridyl transferase(Ref: Harper 31/e page 191)Classic galactosemia due to Galactose 1 Phosphate uridyl transferase is most common cause of galactosemia enzyme deficiencyGalactose 1 Phosphate uridyl transferase (Classic Galactosemia)GalactokinaseUDP Hexose 4 Epimerase