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
Botulinum affects all except - 
Select and explain. 
A. Neuromuscular junction, B. Preganglionic junction, C. Post ganglionic nerves, D. CNS
D: CNS
Answer: D: CNS 
Explanation: None