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 person who's a drug addict stas hearing light and seeing voices. The substance is: 
Select and explain. 
A. LSD, B. Marijuana, C. Cocaine, D. Alcohol
A: LSD
Answer: A: LSD 
Explanation: LSD is a hallucinogen. There is often a 'cross-over' of perceptions (synaesthesia) so that sounds are 'seen' or 'felt' and colours are 'heard'. Distoions of body image are common: a limb may appear to shrink, or become enormous and may seem completely separate from the rest of the body. Ref: Ghodse's Drugs and Addictive Behaviour: A Guide to Treatment By Hamid Ghodse, 2010, Page 93; Kaplan and Sadock's Concise Textbook of Clinical Psychiatry By Benjamin J. Sadock, Virginia A. Sadock, 2008, Page 127