<prompt> Which ONE feature could help to differenciate Alzheimers Dementia from Delirium in a 70 year old man with Urinary Tract Infection?Memory DisturbancesApraxiaDelusionDelusion  <response>: Delirium is broadly defined as an acute decline in attention and cognition. It is characterized by altered sensorium, confusion, stupor, and fluctuations of consciousness. Dementia is defined as a progressive impairment of cognitive functions occurring in clear consciousness i.e. in the absence of delirium. 