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 cause ascending motor paralysis except : 
Select and explain. 
A. Diabetes mellitus, B. Diphtheria, C. Gullien Barre syndrome, D. Porphyria
B: Diphtheria
Answer: B: Diphtheria 
Explanation: Answer is B (Diphtheria): Diptheria is associated with a descending motor paralysis. All other options mentioned in the question give rise to ascending motor paralysis. Impoant causes of descending motor paralysis. Botu I ilium Q. Diphtheria Q Polio These three causes of descending motor paralysis need to be remembered as they are frequently asked and help to answer several questions by exclusion.