An 80-year-old patient suddenly becomes disoriented, agitated, and experiences fluctuating levels of consciousness over 24 hours. The patient's family reports these symptoms are new. The nurse suspects which condition?

✓ Correct Answer: Option C

Delirium is characterized by an acute, sudden onset of fluctuating consciousness, disorientation, and cognitive impairment, often reversible. This distinguishes it from the gradual onset and progressive nature typical of dementia syndromes.