<prompt> All are features of delirium exceptConfusionDisorientationHyperactivityLoss of memory  <response>: 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 