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: Anaesthesia
[{'content': 'Management of chronic pain includes: \nSelect and explain. \nA. Intra-thecal hyperbaric phenol, B. Antrolateral cordotomy, C. Epidural fentanyl, D. All', 'role': 'user'}, {'content': 'Answer: D \nExplanation: A i.e. Intra-thecal hyperbaric phenol, B i.e. Antrolateral cordotomy, C i.e. Epidural fentanyl Management of chronic pain includes patient controlled analgesia (PCA), epidural or intrathecal opioid (fentanyl) & local anesthetic, neurolytic blocks by hypobaric alcohol or hyperbaric phenol, anterolateral cordotomy and various drugs like anticonvulsants, antidepressants, neuroleptics, opioids, serotonergic drugs and az adrenergic agonistQ.', 'role': 'assistant'}]