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 affects all except \nSelect and explain. \nA. Neuromuscular junction, B. Preganglionic junction, C. Post ganglionic nerves, D. CNS', 'role': 'user'}, {'content': "Answer: D \nExplanation: Botulinum toxin acts by blocking the production or release of acetylcholine at the synapses and NMJ. CNS is spared. Onset is marked by diplopia, dysphagia and dysahria due to cranial nerve involvement. Reference: Textbook of Microbiology; Anathanarayan and paniker's; 10th edition; Page no: 269", 'role': 'assistant'}]