This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Metabolism of carbohydrate, Subject name: Biochemistry
Positive signals for glycogen breakdown include in all the following except 
Select and explain. 
A. Cyclic AMP, B. Blood glucose, C. Epinephrine, D. Ca2+
B: Blood glucose
Answer: B: Blood glucose 
Explanation: They conve glycogen into glucose (this process is called glycogenolysis). The glucose is released into the bloodstream, increasing blood sugar. Hypoglycemia.Increased blood glucose level decreases the rate of glycogenolysis and increases glycogenesis.