A Patient Has Been Admitted with a Diagnosis of Confusion

A patient has been admitted with a diagnosis of confusion.The physician's admission note states that he wants to assess for delirium versus dementia.The nurse knows that the main differences are:

A) Delirium usually lasts several years, whereas dementia lasts only a few days.
B) Delirium usually has sudden onset and is reversible, whereas dementia is chronic and irreversible.
C) Dementia is usually caused by medications, whereas delirium is not.
D) Dementia is easily treated with reality orientation, whereas delirium is not.