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
Characteristic of alcohol withdrawal? 
Select and explain. 
A. Hallucination, B. Illusion, C. Delusion, D. Drowsiness
A: Hallucination
Answer: A: Hallucination 
Explanation: A i.e. Hallucination