This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Organic Mental Disorders, Subject name: Psychiatry
[{'content': 'Delirium and dementia can be differentiated by: \nSelect and explain. \nA. Loss of memory, B. Apraxia, C. Delusion, D. Altered sensorium', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Please remember that the hallmark of delirium is disturbance of consciousness (altered sensorium) whereas in dementia, there is no disturbance of consciousness. DELIRIUM DEMENTIA Onset Sudden onset Insidious onset Consciousness Disturbed NO Disturbance Course Fluctuating Course Progressive course', 'role': 'assistant'}]