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
Altered (bizarre) perception/interpretation of real objects is most appropriately known as: 
Select and explain. 
A. Illusion, B. Delusion, C. Hallucination, D. Delirium
A: Illusion
Answer: A: Illusion 
Explanation: A i.e. Illusion