This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Autonomic nervous system, Subject name: Pharmacology
[{'content': 'Action of alpha 2 and b1 receptors on adenyl cyclase \nSelect and explain. \nA. Stimulate; Stimulate, B. Stimulate; Inhibit, C. Inhibit; Inhibit, D. Inhibit; Stimulate', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Beta receptors are GsPCR -so increase adenyl cyclase activity.alpha 1 -g1 pcr,alpha 2 GiPCR-decrease adenyl cyclase activity Ref: KD Tripathi 8th ed.', 'role': 'assistant'}]