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
Yawning is a feature of 
Select and explain. 
A. Alcohol withdrawl, B. Cocaine withdrawl, C. Cannabis withdrawl, D. Opoid withdrawl
D: Opoid withdrawl
Answer: D: Opoid withdrawl 
Explanation: Opoid withdrawl