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
Which of the following is a stimulant? 
Select and explain. 
A. Cocaine, B. Alcohol, C. Nicotine, D. Cannabis
A: Cocaine
Answer: A: Cocaine 
Explanation: Stimulants Non stimulants Methylphenidate, dexmethylphenidate Atomoxetine Amphetamines Bupropion Modafinil Clonidine, Guanfacine Cocaine Venlafaxine Nicotine has dual action to stimulate or depress neural activity.