This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Glycogen, Subject name: Biochemistry
Which of the following is a debranching enzyme: 
Select and explain. 
A. Glycogen synthetase, B. Glucose-6-phosphatase, C. Amylo alpha-1,6-glucosidase, D. Amylo (1,4)-(1,6) trans glycosylase
C: Amylo alpha-1,6-glucosidase
Answer: C: Amylo alpha-1,6-glucosidase 
Explanation: Debranching enzyme is a Bifunctional enzyme with two activities Glucan transferase Amylo a-1,6-glucosidase breaks the alpha (1-6) glycosidic bond present at the branch point of glycogen in glycogen breakdown. Other Options: Glycogen synthetase transfer glucose from UDP-glucose to glycogenin. Glycogen branching enzyme (also known as amylo-a(1,4)-a(1,6) trans glycosylase) make glycogen branches by transferring the end of the chain onto an earlier pa a-1,6 glycosidic bond. Glucose-6-phosphatase dephosphorylates glucose-6-phosphate to free glucose.