A Nursing Student Asks Why a Direct-Acting Cholinergic Agonist Drug

A nursing student asks why a direct-acting cholinergic agonist drug that is selective to muscarinic receptors is described as being non-specific. The nurse will explain that this is because:

A) muscarinic receptors are present in many different tissues.
B) the action of cholinesterase alters the bioavailability at different sites.
C) these drugs can also affect nicotinic receptors.
D) they vary in their reversible and irreversible effects.