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 antitussive can lead to hallucinations \nSelect and explain. \nA. Morphine, B. Dextromethorphan, C. Diphenhydramine, D. Aprepitant', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Dextromethorphan is a NMDA antagonist used for Mild cough, which can lead to hallucination & addiction.', 'role': 'assistant'}]