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
[{'content': 'CB 1 antagonist used in smoking cessation is ? \nSelect and explain. \nA. Naloxona, B. Rimonabant, C. Vareniloline, D. Bupripion', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Rimonabant Rimonabant A selective cannabinoid receptor-1 (CB-1) antagonist which is being tried as antismoking and antiobesity drug.", 'role': 'assistant'}]