The doctor has explained Grace's condition as post-op Delirium, as well as the probable outcome to Grace's family. Which of the following statements by the family would indicate understanding of what to expect with regard to the nature and course of Grace's illness?

Choice A reason: Psychotherapy is not the primary treatment for delirium. Delirium is an acute medical emergency characterized by a clouded sensorium caused by underlying physiological disruptions. Treatment focuses on identifying and reversing the organic cause, not on addressing psychological coping mechanisms or personality traits through talk therapy. Choice B reason: This statement correctly identifies that delirium is often caused by physiological stressors such as medications, anesthesia, or metabolic imbalances. It also accurately reflects that delirium is typically acute and reversible, with cognitive function returning to baseline once the underlying medical issues are resolved and stabilized. Choice C reason: This statement describes the typical course of a neurocognitive disorder like Alzheimer's disease, which is characterized by a slow, progressive, and irreversible decline. Delirium, conversely, has an abrupt onset and a fluctuating course, and it is usually temporary rather than a permanent state of deterioration. Choice D reason: Improvement within 4 to 6 months following antidepressant initiation describes the timeline for treating Major Depressive Disorder, not delirium. Delirium usually resolves much faster—within days or weeks—once the causative factor is removed, and antidepressants are not the standard treatment for acute postoperative confusion.