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: Psychiatry
[{'content': 'Which of the following antismoking drugs can lead to suicidal ideation? \nSelect and explain. \nA. Baclofen, B. Rimonobant, C. Varenicline, D. Naltrexone', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Vareniciline is a partial agonist at\xa0α4 β2 substype of nicotine receptor used to treat tobbacco addiction.\nSide effects include suicidal ideation, nausea, headache & insomnia.', 'role': 'assistant'}]