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
Botulinum toxin acts by 
Select and explain. 
A. Secretion of Ach, B. Synthesis of ACh, C. Inhibits Ach release, D. Muscle nerve block
C: Inhibits Ach release
Answer: C: Inhibits Ach release 
Explanation: Ref: HL Sharma 3rd ed pg no:133 botulinum toxin and beta-bungaro toxin inhibits the release of Ach into the synapse