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
Flash backs are seen with 
Select and explain. 
A. LSD, B. Cocaine, C. Opiate, D. Amphetamine
A: LSD
Answer: A: LSD 
Explanation: A i.e. LSD Spontaneous recurrence of LSDQ, or sometimes cannabis use experience even during a withdrawl state is known as Flash back LSD intoxication causes bad tripsQ ie acute panic reaction in which the individual experiences a loss of control over his self.