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: Pharmacology
[{'content': 'Which of the following opioid can be given intranasally? \nSelect and explain. \nA. Tramadol, B. Pethidine, C. Butorphanol, D. Buprenorphine', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Butorphanol is full agonist at kappa & antagonist at μ\xa0receptor that can be given intranasally.', 'role': 'assistant'}]