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-back' phenomenon is seen with the use of - \nSelect and explain. \nA. Cannbis, B. Psilocybin, C. LSD, D. All of the above", 'role': 'user'}, {'content': 'Answer: D \nExplanation: Flash-back is the spontaneous occurrence of previously experienced drug effects without taking the drug at the moment. Flash-back is usually associated with hallucinogens (LSD, Psilocybin, psilocin) and occasionally with cannabis (marijuana).', 'role': 'assistant'}]