This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General pharmacology, Subject name: Pharmacology
Which of the following drugs causes increase in cAMP levels 
Select and explain. 
A. Somatostatin, B. Beta receptor, C. Alpha receptor, D. Acetylcholine
B: Beta receptor
Answer: B: Beta receptor 
Explanation: Beta-adrenergic and alpha adrenergic receptors are G protein-coupled receptors among them, beta receptors are GS PCR- stimulatory type- stimulate adenyl cyclase- increase CAMP alpha 2-inhibitory, alpha1- G q PCR- increasing or decreasing IP3 and DAG levels REF KD tripathi 8th ed