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
Buprenorphine is ? 
Select and explain. 
A. Partial agonist at mu Receptor, B. Partial agonist at K Receptor, C. Full Agonist at n Receptor, D. Full Agonist at K receptor
A: Partial agonist at mu Receptor
Answer: A: Partial agonist at mu Receptor 
Explanation: None