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: Physiology
Ventrolateral cordotomy for relief of pain in right lower limb is by cutting the: 
Select and explain. 
A. Left ventral spinothalamic tract, B. Left lateral spinothalamic tract, C. Right ventral spinothalamic tract, D. Right lateral spinothalamic tract
B: Left lateral spinothalamic tract
Answer: B: Left lateral spinothalamic tract 
Explanation: Pain and temperature is carried by lateral spinothalamic tract. This tract cross obliquely to the opposite side within one spinal segment and ascend in the opposite anterolateral white column as the lateral spinothalamic tract. So, pain from right leg relieved by cutting left lateral spinothalamic tract.