This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pharmacology
Botulinum toxin act by: 
Select and explain. 
A. Synthesis of Ach., B. inhibits Ach release., C. Secretion of Ach., D. None of the above.
B: inhibits Ach release.
Answer: B: inhibits Ach release. 
Explanation: None