Which of the following autonomic drugs acts by stimulating adenylate cyclase?

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[I C $1 \mathrm{c}$, d; Table 2.2]. Among the autonomic drugs, only $\beta_{1}$ and $\beta_{2}$ adrenergic agonists act by stimulating adenylate cyclase. Norepinephrine is a $\beta_{1}$ agonist. Atropine is a muscarinic cholinergic antagonist. Clonidine is an $\alpha_{2}$ adrenergic agonist. Curare is a nicotinic cholinergic antagonist. Phentolamine is an $\alpha_{1}$ adrenergic antagonist. Phenylephrine is an $\alpha_{1}$ adrenergic agonist. Propranolol is a $\beta_{1}$ and $\beta_{2}$ adrenergic antagonist.

Which of the Following Autonomic Drugs Acts by Stimulating Adenylate