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
In glycogenolysis, adrenaline acts on 
Select and explain. 
A. Glucokinase, B. Hexokinase, C. Phosphorylase, D. None of the above
C: Phosphorylase
Answer: C: Phosphorylase 
Explanation: Regulation of glycogen degradation by cAMP: The hormones like epinephrine and glucagon bring about glycogenolysis by their action on glycogen phosphorylase through cAMP. Glycogen phosphorylase exists in two forms, an active 'a' form and inactive form'b'.