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
Adrenaline acts on which enzyme in glycogenolysis 
Select and explain. 
A. Glucokinase, B. Hexokinase, C. Phosphorylase, D. Glucose diphosphatase
C: Phosphorylase
Answer: C: Phosphorylase 
Explanation: Epinephrine (adrenaline) stimulates glycogenolysis by activating glycogen phosphorylase.