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
Hallucinations are - 
Select and explain. 
A. Feeling of familiarity with unfamiliar thing, B. Alteration of perception of ones reality, C. Misinterpretation of stimuli, D. Perception occurring without external stimulation
D: Perception occurring without external stimulation
Answer: D: Perception occurring without external stimulation 
Explanation: None