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': 'Most common perceptual disturbance in delirium is? \nSelect and explain. \nA. Illusion, B. Decreased perceptions per unit of time, C. Visual Hallucination, D. Auditory hallucination', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. is\'b\'i.e., Decreased perceptions per unit of timelRef: Neurology in Clinical Practice: Principles of diagnosis and management 4h/e p. 301The most common perceptual disturbance is decreased perceptions per unit of time."', 'role': 'assistant'}]