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
CB 1 antagonist used in smoking cessation is ? 
Select and explain. 
A. Naloxona, B. Rimonabant, C. Vareniloline, D. Bupripion
B: Rimonabant
Answer: B: Rimonabant 
Explanation: Ans. is 'b' i.e., Rimonabant Rimonabant A selective cannabinoid receptor-1 (CB-1) antagonist which is being tried as antismoking and antiobesity drug.