This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Surgery
[{'content': 'The advantage of using epidural opioids over local anaesthetics are all except \nSelect and explain. \nA. Less hypotension, B. No motor block, C. Frequent injections not required, D. Less expensive', 'role': 'user'}, {'content': 'Answer: D \nExplanation: The main drawback of local anaesthetics is that there is possibility of motor blockade if higher concentration is used and motor paralysis is not acceptable in postoperative period. Other advantages are no sympathetic block so hypotension is less and after one single dose of morphine analgesia may last for 12-16 hours.', 'role': 'assistant'}]