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
A young city dweller presented with history of drug abuse and complaining of change in perception, like hearing sights and seeing sounds. Substance responsible for this: AI 12 
Select and explain. 
A. LSD, B. Phencyclidine, C. Cocaine, D. Amphetamine
A: LSD
Answer: A: LSD 
Explanation: Ans. LSD