This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General physiology, Subject name: Physiology
[{'content': 'Function of CAMP \nSelect and explain. \nA. Ion exchange, B. Activation of protein kinase, C. Activation of Ryanodine receptors, D. Release of acetylcholine', 'role': 'user'}, {'content': 'Answer: B \nExplanation: CAMP is a secondary messager, used for intracellular signal transduction, such as transferring into cells the effect of hormones like glucagon etc.it is involved in activation of protein kinase Ref:Guyton and Hall textbook of medical physiology 12th edition,page number 540 ,541,542', 'role': 'assistant'}]