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
Perception without stumuli is 
Select and explain. 
A. Delusion, B. Illusion, C. Hallucination, D. Delirium
C: Hallucination
Answer: C: Hallucination 
Explanation: C i.e. Hallucination