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 on opioid receptors is: 
Select and explain. 
A. Pure agonist, B. Pure antagonist, C. Paial agonist, D. None
C: Paial agonist
Answer: C: Paial agonist 
Explanation: Pure morphine like opioids in general acts on Mu and K receptors. Mixed agonists-antagonists: Nalorphine Butorphanol Pentazocine Paial agonists: Buprenorphine Pure competitive opioid antagonists Naloxone Naltrexone Nalmefene Ref: K.D.T 6th Ed Page 464.