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
Botulin acts by: 
Select and explain. 
A. Secretion of Ach, B. 1Synthesis of Ach, C. Inhibits Ach release, D. Muscle nerve block
C: Inhibits Ach release
Answer: C: Inhibits Ach release 
Explanation: Inhibits Ach release