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
Glycogenolysis is best described by which of the following statements: 
Select and explain. 
A. It involves enzymes cleaving beta(1- 4) glycosidic linkage, B. Requires activation of glycogen synthase, C. Requires a bifunctional enzyme (debranching and transferase), D. Requires inactivation of phosphorylase kinase
C: Requires a bifunctional enzyme (debranching and transferase)
Answer: C: Requires a bifunctional enzyme (debranching and transferase) 
Explanation: Bifunctional enzymes(two enzymatic activities present on a single protein) involve : Debranching enzyme Glucan transferase . (Option c) -(Option a)- Glycogenolysis - cleaving alpha(1 - 4) bonds, not b (1- 4) bonds. -(Option b) -requires activation of glycogen phosphorylase , not glycogen synthase -(Option d)- It requires activation (not inactivation )of phosphorylase kinase