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': 'Epidural narcotic is preferred over epidural LA because it causes – \nSelect and explain. \nA. Less respiratory depression, B. Less dose is required, C. No motor paralysis, D. No retention of urine', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Epidural opioids produce only sensory block without sympathetic and motor block.', 'role': 'assistant'}]