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
[{'content': 'In glycogenolysis, adrenaline acts on \nSelect and explain. \nA. Glucokinase, B. Hexokinase, C. Phosphorylase, D. None of the above', 'role': 'user'}, {'content': "Answer: C \nExplanation: 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'.", 'role': 'assistant'}]