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
A partial agonist at acetylcholine nicotinic receptors that can be used in smoking cessation programs is 
Select and explain. 
A. Acamprosate, B. Varenicline, C. Buprenorphine, D. Nalbuphine
B: Varenicline
Answer: B: Varenicline 
Explanation: None