This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous, Subject name: Psychiatry
[{'content': 'Altered presumption of real objects is \nSelect and explain. \nA. Illusion, B. Delusion, C. Hallucination, D. Delirium', 'role': 'user'}, {'content': "Answer: A \nExplanation: (A) Illusion # Hallucination-- caused by a substance; seeing and/or hearing people, objects that are not there & verbally responding to them.> Delusion--false idea; misbeliefs (example) thinking one is a king or God or the president. Ideas of grandeur.> Illusion-- seeing an object that isn't there; misconception of looking at something, but seeing it as something other than what it really is. (E.g.) a puff of smoke may look like a ghostly figure or a tree trunk with branches, may look like a person with arms extended.", 'role': 'assistant'}]