This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Symptoms and signs in psychiatry and classification, Subject name: Psychiatry
[{'content': 'All are features of delirium except \nSelect and explain. \nA. Confusion, B. Disorientation, C. Hyperactivity, D. Loss of memory', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Delirium is the commonest organic symptom seen in clinical practice Characterised by acute onset, clouding of consciousness, disorientation, asterixis, multifocal myoclonus, occupational delirium, tone and reflex abnormalities (Ref: A sho textbook of psychiatry, Niraj Ahuja, 7th edition, pg no.19)', 'role': 'assistant'}]