This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Psychiatry
[{'content': 'Perception without stimuli is \nSelect and explain. \nA. Delusion, B. Illusion, C. Hallucination, D. Delirium', 'role': 'user'}, {'content': "Answer: C \nExplanation: Delusion: False belief, based on incorrect inference about external reality, that is firmly held despite objective and obvious contradictory proof or evidence and despite the fact that other members of the culture do not share the belief. Delirium: Acute reversible mental disorder characterized by confusion and some impairment of consciousness; generally associated with emotional lability, hallucinations or illusions, and inappropriate, impulsive, irrational, or violent b Reference:p.922 chap 7.3 Signs and Symptoms in Psychiatry(Kaplan & Sadock's Comprehensive Textbook of Psychiatry, 9th Edition)", 'role': 'assistant'}]