This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Symptoms & Signs , Subject name: Psychiatry
False perception with sensory stimulus is 
Select and explain. 
A. Delusion, B. Hallucination, C. Perseverance, D. Illusion
D: Illusion
Answer: D: Illusion 
Explanation: Ans. d (Illusion) (Ref. Ahuja Psychiatry 6th/pg. 263)TermMeaningHallucinationsAre perceptions in the absence of external stimuli.IllusionsAre misinterpretations of actual external stimuli.DelusionsAre false beliefs not shared with other members of culture/subculture that are firmly maintained in spite of obvious proof to the contrary.