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
Following are features of morphine withdrawl, except: 
Select and explain. 
A. Piloerection, B. Insomnia, C. Discharge from nose, D. Constipation
D: Constipation
Answer: D: Constipation 
Explanation: Constipation