This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Central Nervous system, Subject name: Pharmacology
Buprenorphine is: 
Select and explain. 
A. paial agonist at mu Receptor, B. Paial agonist at kappa Receptor, C. Full Agonist at mu Receptor, D. Full Agonist at kappa Receptor
A: paial agonist at mu Receptor
Answer: A: paial agonist at mu Receptor 
Explanation: Ref : Katzung 11/e p546 *Buprenorphine appears to be a paial agonist at mu Receptor and antagonist at kappa Receptor.