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: Unknown
Which substance, if used for a long time is associated with memory loss? 
Select and explain. 
A. Marijuana, B. Alcohol, C. Cocaine, D. LSD
B: Alcohol
Answer: B: Alcohol 
Explanation: Alcohol amnestic disorder (Korsakoff syndrome) is the result of long-term alcohol abuse.