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 sense of perception without any external object or stimulus is known as: 
Select and explain. 
A. Illusions, B. Impulse, C. Hallucination, D. Phobia
C: Hallucination
Answer: C: Hallucination 
Explanation: Ans. is 'c' i.e. Hallucination Hallucination - A perception that occurs in the absence of a stimulusIllusions - A misinterpretation of stimuli arising from external objects.Phobia - An irrational fear of an object, situation or activityImpulse - A sudden often unreasoning determination to perform some act.