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 is hallucinogenic? \nSelect and explain. \nA. Codeine, B. Cocaine, C. Papaverine, D. Steroid', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Cocaine', 'role': 'assistant'}]