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
Most common perceptual disturbance in delirium is? 
Select and explain. 
A. Illusion, B. Decreased perceptions per unit of time, C. Visual Hallucination, D. Auditory hallucination
B: Decreased perceptions per unit of time
Answer: B: Decreased perceptions per unit of time 
Explanation: 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."