This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Bacteriology, Subject name: Microbiology
[{'content': 'Botulinum toxin acts on \nSelect and explain. \nA. Parasympathetic system, B. Sympathetic system, C. Brain, D. Sensory nerves', 'role': 'user'}, {'content': "Answer: A \nExplanation: It acts by blocking the production and release of acetylcholine at synapses and NMJ. Thus affects the parasympathetic system. Reference: Textbook of Microbiology; Anathanarayan and paniker's; 10th edition; Page no: 269", 'role': 'assistant'}]