This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Forensic Psychiatry, Subject name: Forensic Medicine
[{'content': 'False perception without any external stimulus is: \nSelect and explain. \nA. Illusion, B. Hallucination, C. Delirium, D. Delusion', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. (B). HallucinationDisorder of thought- Delusion.Disorder of orientation, thought content - DeliriumFalse perception without stimulus - HallucinationFalse interpretation of existing stimulus - Illusion', 'role': 'assistant'}]