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: Unknown
[{'content': 'Varenicline is used in - \nSelect and explain. \nA. Nicotine addiction, B. Alcohol addiction, C. Heroin addiction, D. LSD intoxication', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e. Nicotine addiction (ref: Information Technology for Addiction Recovery: Medicine)o Repeat from previous sessions.", 'role': 'assistant'}]