This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous, Subject name: Psychiatry
Who introduced cocaine in psychiatry? 
Select and explain. 
A. Freud, B. Jung, C. Miller, D. Stanley
A: Freud
Answer: A: Freud 
Explanation: Sigmund Freud studied about the effects of cocaine. It is also believed that he was addicted to cocaine for a long period.