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
Treatment is not required in withdrawal of -a) Cannabisb) Alcoholc) Amphetamined) LSD 
Select and explain. 
A. b, B. c, C. ac, D. ad
D: ad
Answer: D: ad 
Explanation: Clinically significant withdrawal syndrome (requires treatment) :- Alcohol, opioids, amphetamines, Barbiturates, BZDs, Nicotine.
No or minimal clinically significant withdrawal syndrome (requires no treatment) :- LSD (nil), Cannabis (minimal).