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
Anterior spinal Aery thrombosis is characterized by all, except: 
Select and explain. 
A. Loss of pain & touch, B. Loss of vibration sense, C. Loss of power in lower limb, D. Sphincter dysfunction
B: Loss of vibration sense
Answer: B: Loss of vibration sense 
Explanation: Answer is B (Loss of vibration sense): Anterior spinal aery thrombosis does not involve the posterior column and hence vibration sense and joint positions sense (proprioception) are preserved.