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
Acute opioid withdrawl is characterizedby 
Select and explain. 
A. Rhinorrhoea, B. Piloerection, C. Insomnia, D. All
D: All
Answer: D: All 
Explanation: A, B, C i.e. Rhinorrhoea, Piloerection, Insomnia