This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Pharmacodynamics, Subject name: Pharmacology
[{'content': 'Botulinum toxin acts on - \nSelect and explain. \nA. Synapse, B. Smooth muscle of intestine, C. Central nervous system, D. Sensory nerves', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Synapseo Botulinum toxin affectsNeuromuscular junction.Postganglionic parasympathetic nerve endings.Peripheral ganglia.o Central nervous system is not involved and there is no sensory involvement.o Botulinum toxin acts by inhibiting the calcium mediated exocytosis of ACh from the vesicles in the synapse.", 'role': 'assistant'}]