This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nervous System, Subject name: Physiology
[{'content': 'A person with intractable pain over the right leg is benefited by \nSelect and explain. \nA. Right spinothalamic tract cordotomy, B. Left Spinothalamic tract cordotomy, C. Right hemicordotomy, D. Left hemicordotomy', 'role': 'user'}, {'content': 'Answer: B \nExplanation: (B) Left Spinothalamic tract cordotomy > Spinothalamic tract Touch sensation is transmitted by ventral spinothalamic tract Pain and temperature pain are transmitted by lateral spinothalamic tract> Fibers of spinothalamic tract cross in the anterior commissure of the cord to the opposite> Hence intractable pain over the right leg is benefited by left spinothalamic tract cordotomy.> In anterolateral cordotomy, the spinothalamic tracts are carefully cut to relieve severe pain.', 'role': 'assistant'}]