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': 'Flash backs are seen with \nSelect and explain. \nA. LSD, B. Cocaine, C. Opiate, D. Amphetamine', 'role': 'user'}, {'content': 'Answer: A \nExplanation: 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.', 'role': 'assistant'}]