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
[{'content': 'Increase in cAMP is caused by \nSelect and explain. \nA. a (Alpha) receptor, B. Somatostatin, C. b (Beta) receptor, D. Acetylcholine', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ref:- kd tripathi; pg num:-48', 'role': 'assistant'}]