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
Which among the following does not cause exaggerated jaw jerk - 
Select and explain. 
A. Multiple sclerosis, B. Motor neurone disease, C. Pseudobulbar palsy, D. Syringomyelia
D: Syringomyelia
Answer: D: Syringomyelia 
Explanation: None