This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Biochemistry
Galactosemia commonly is due to deficiency of 
Select and explain. 
A. Galactose-1 phosphate uridyl transferase, B. Galactose-1 phosphatase, C. Glucose-1 phosphatase, D. Glucose-6 phosphatase
A: Galactose-1 phosphate uridyl transferase
Answer: A: Galactose-1 phosphate uridyl transferase 
Explanation: Galactose-1 phosphate uridyl transferase 
Galactosemia is due to deficiency of :

Galactose-1-phosphate uridyl transferase (most common and best known),
Galactokinase, and
UDP-Galactose-4-epimerase.