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
[{'content': 'Mechanism of action of botulinum toxin: Kerala 11 \nSelect and explain. \nA. Synthesis of acetylcholine inhibited, B. Reuptake of ACH is increased, C. Blocks nicotinic receptors in muscle, D. Blocks muscarinic receptors in brain', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. Synthesis of acetylcholine inhibited', 'role': 'assistant'}]