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 of the following is not. true regarding myelopathy? 
Select and explain. 
A. Sensory loss of facial area, B. Brisk jaw jerk, C. Brisk pectoral jerk, D. Urgency and incontinence of micturition
B: Brisk jaw jerk
Answer: B: Brisk jaw jerk 
Explanation: Ans. b. Brisk jaw jerk(Ref: De Jongs Neurological examination/ p194, 201, 474.'Jaw jerk is exaggerated in supranuclear lesions that are above the mid pons.