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
[{'content': 'A ventrolateral cordotomy is performed to produce relief of pain from the right leg. It is effective because it interrupts the - \nSelect and explain. \nA. Left Dorsal Column, B. Left Lateral Spinothalamic Tract, C. Right Lateral Spinothalamic Tract, D. Right corticospinal Tract', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]