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': 'Which of the following drug is used as an antismoking drug \nSelect and explain. \nA. Trimethoprim, B. Fluvoxate, C. Biperiden, D. Mecamylamine', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Mecamylamine is Nicotine receptor antagonist used against smoking.', 'role': 'assistant'}]