This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Symptoms and signs in psychiatry and classification, Subject name: Psychiatry
Perceptional misinterpretation of a real object is 
Select and explain. 
A. Hallucination, B. Schizophrenia, C. Illusion, D. Delusion
C: Illusion
Answer: C: Illusion 
Explanation: Illusion: Perceptual misinterpretation of a real external stimulus. Reference: Kaplan & Sadock's Synopsis of Psychiatry: Behavioral Sciences/Clinical Psychiatry, 11th Edition, page 1413.