Which of the following substances will block the action of acetylcholine at the postganglionic endings in the parasympathetic autonomic nervous system (PANS)?

Question

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Atropine will block the action of acetylcholine at the postganglionic endings in the PANS.Differences exist among receptors that have acetylcholine as a neurotransmitter-subtypes of acetylcholine-innervated receptors that are located in anatomically different synapses.Curare blocks the response of skeletal muscle to acetylcholine but does not block its effect on tissues such as the salivary gland.Hexamethonium blocks the action of acetylcholine at the ganglia.

Which of the Following Substances Will Block the Action of Acetylcholine