This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Gluconeogenesis, Subject name: Biochemistry
Glucagon stimulates - 
Select and explain. 
A. Gluconeogenesis, B. Glycogenesis, C. Fatty acid synthesis, D. Glycolysis
A: Gluconeogenesis
Answer: A: Gluconeogenesis 
Explanation: Ans. is 'a' i.e.. Gluconeogenesiso Glucagon is a polypeptide hormone which is secreted by the A cells of the islets of Langerhans of pancreas. Glucagon is a group IIA hormone, i.e., acts by increasing cAMP. The actions of glucagon are somewhat opposite those of insulin.Glucagon stimulates glycogenolysis in the liver but not in muscle. Breakdown of glycogen yields glucose.Glucagon stimulates production of glucose from amino acids (gluconeogenesis). Both glycogenolysis and gluconeogenesis tend to raise plasma glucose level.Glucagon stimulates lipolysis. Breakdown of lipids yields free fatty acids, which may be oxidized completely to carbon dioxide, or incompletely to form ketone bodies.