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: Medicine
All causes ascending motor paralysis, except - 
Select and explain. 
A. Diabetes mellitus, B. Diphtheria, C. Guillain Bane syndrome, D. Porphyria
B: Diphtheria
Answer: B: Diphtheria 
Explanation: None