This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous, Subject name: Medicine
[{'content': 'Treatment of tobacco addiction - \nSelect and explain. \nA. Nicotine, B. Bupropion, C. Mecanylate, D. Dopanfiine', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Nicotine is a stimulant and potent parasympathomimetic alkaloid that is naturally produced in the nightshade family of plants. It is used for the treatment of tobacco use disorders as a smoking cessation aid and nicotine dependence for the relief of withdrawal symptoms Ref Davidson 23rd edition pg 556', 'role': 'assistant'}]