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: 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: None', 'role': 'assistant'}]