This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Autonomic nervous system, Subject name: Pharmacology
[{'content': 'Botulinum toxin acts by \nSelect and explain. \nA. Secretion of Ach, B. Synthesis of ACh, C. Inhibits Ach release, D. Muscle nerve block', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ref: HL Sharma 3rd ed pg no:133 botulinum toxin and beta-bungaro toxin inhibits the release of Ach into the synapse', 'role': 'assistant'}]