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': 'Buprenorphine is ? \nSelect and explain. \nA. Partial agonist at mu Receptor, B. Partial agonist at K Receptor, C. Full Agonist at n Receptor, D. Full Agonist at K receptor', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]