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': 'Which is not true about hallucination - \nSelect and explain. \nA. It is as vivid as normal stimulus, B. It occurs in inner subjective space, C. It is independent of will of observer, D. It occurs in absence of perceptual stimuli', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Characteristics of Hallucinations:-\n\n\nThe absence of corresponding external perceptual stimuli\nVividness, force and the real value of normal perception.\nThe experience occurs spontaneously\nIt cannot be produced or terminated at will by subject (not in conscious or voluntary control).\nPerceived as being in external objective space.\nHave relative permanency (i.e. remain constant and unchanged).\nHallucinations are usually experienced alongside and simultaneously with normal perception.', 'role': 'assistant'}]