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
False sense of perception without any external object or stimulus is known as : 
Select and explain. 
A. Illusion, B. Impulse, C. Hallucination, D. Phobia
C: Hallucination
Answer: C: Hallucination 
Explanation: None