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
Symptomatic treatment is not required in withdrawal of - 
Select and explain. 
A. Cannabis, B. Morphine, C. Alcohol, D. Cocaine
A: Cannabis
Answer: A: Cannabis 
Explanation: Since cannabis causes very mild withdrawal symptoms hence, no symptomatic treatment is required. LSD and other hallucinogens also do not cause any withdrawal symptoms or tolerance.