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 a stimulant \nSelect and explain. \nA. Alcohol, B. Nicotine, C. Cannabis, D. Cocaine', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Cocaine and amphetamine are included under stimulant group of drugs.', 'role': 'assistant'}]