Final answer:
Hexamethonium is a drug that affects autonomic ganglia by blocking nicotinic receptors, which are important for neuronal transmission through both sympathetic and parasympathetic systems. It would be the correct answer among the provided options for drugs affecting ganglia.
Step-by-step explanation:
The specific question you asked revolves around drugs that affect the autonomic ganglia. Among the choices you listed, Hexamethonium is known to affect ganglionic transmission, as it is a ganglionic blocker that targets nicotinic receptors in the autonomic ganglia. These receptors are crucial in the transmission of impulses through the autonomic ganglia and hence, Hexamethonium impacts both the sympathetic and parasympathetic systems.
Regarding the question on the antidote for atropine poisoning, nicotinic agonist drugs would not be appropriate as an antidote because atropine works by blocking muscarinic receptors. An antidote would need to counteract this effect, therefore, a muscarinic agonist would be the right choice. Anti-anxiety effects are typically seen with drugs that promote relaxation and reduce the activity of certain neurotransmitters that are associated with anxiety. Among the options provided, these effects are not directly associated.