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: Forensic Medicine
Yawning is a common feature of: AIIMS 06 
Select and explain. 
A. Alcohol withdrawal, B. Cocaine withdrawal, C. Cannabis withdrawal, D. Opioid withdrawal
D: Opioid withdrawal
Answer: D: Opioid withdrawal 
Explanation: Ans. Opioid withdrawal