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 substances is associated with flashback phenomenon? 
Select and explain. 
A. Cannabis, B. LSD, C. Psilocybin, D. All of the above
D: All of the above
Answer: D: All of the above 
Explanation: Cannabis and hallucinogens can cause Flash back phenomenon Flash back phenomenon: Re-experience of the sensations associated with use in the absence of the drug even months after the last dose