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
[{'content': 'False sense of perception without any external object or stimulus is known as : \nSelect and explain. \nA. Illusion, B. Impulse, C. Hallucination, D. Phobia', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]