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: Forensic Medicine
Mechanism of action of botulinum toxin: Kerala 11 
Select and explain. 
A. Synthesis of acetylcholine inhibited, B. Reuptake of ACH is increased, C. Blocks nicotinic receptors in muscle, D. Blocks muscarinic receptors in brain
A: Synthesis of acetylcholine inhibited
Answer: A: Synthesis of acetylcholine inhibited 
Explanation: Ans. Synthesis of acetylcholine inhibited