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
The follwing are opioid withdrawl symptoms except: 
Select and explain. 
A. Insomnia, B. Piloerection, C. Rhinorrhea, D. Constipation
D: Constipation
Answer: D: Constipation 
Explanation: D i.e. Constipation