<prompt> A patient with pneumonia for 5 days is admitted to the hospital in altered sensorium. He suddenly ceases to recognize the doctor and staff. He thinks that he is in jail and complains of scorpion attacking him. His probable diagnosis is:Acute dementiaAcute deliriumAcute schizophreniaAcute paranoia  <response>: History of Medical disorder pneumonia Followed by disturbances in consciousness altered sensorium, disorientation failure to recognize doctor and staff and thinking that he is in jail and Hallucinations scorpions attacking is suggestive of delirium. 