What is the mechanism of action of the drug botulinum?
A) It inhibits the release of acetylcholine from cholinergic nerve endings.
B) It enhances the activity of the enzyme acetylcholinesterase.
C) It displaces acetylcholine from muscarinic receptor sites and prevents it from producing its effects.
D) It permanently inactivates acetylcholinesterase by forming an irreversible bond with the enzyme.
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