This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Pancreas, Subject name: Physiology
[{'content': 'What is the mechanism of action of glucagon? \nSelect and explain. \nA. Inositol Pathway, B. Arachidonic Acid Pathway, C. c-GMP Pathway, D. c-AMP Pathway', 'role': 'user'}, {'content': 'Answer: D \nExplanation: ANSWER: (D) c AMP pathwayREF: Guyton 12th ed pg 948Glucagon causes glycogenolysis in the liver and this in turn increases the blood glucose levels by the following mechanismGlucagon activates adenylyl cyclase in the hepatic cell membraneThis causes formation of cAMPActivation of protein kinase regulator proteinActivation of protein kinaseActivation of phosphorylase b kinaseConversion of phosphorylase b to phosphorylase aDegradation of glycogen to glucose 1 phosphateDephosporylation and release of glucose', 'role': 'assistant'}]