This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Substance Related and Addictive Disorders, Subject name: Psychiatry
[{'content': 'Which of the following is a stimulant? \nSelect and explain. \nA. Cocaine, B. Alcohol, C. Nicotine, D. Cannabis', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Stimulants Non stimulants Methylphenidate, dexmethylphenidate Atomoxetine Amphetamines Bupropion Modafinil Clonidine, Guanfacine Cocaine Venlafaxine Nicotine has dual action to stimulate or depress neural activity.', 'role': 'assistant'}]