Considering the DSM-5 classification, which neurocognitive disorder is most likely to progress rapidly?

A. Delirium is characterized by a sudden onset of cognitive impairment and fluctuating consciousness, often developing over hours to days. It is considered an acute neurocognitive disorder and can progress rapidly if the underlying cause (e.g., infection, medication, metabolic imbalance) is not identified and treated promptly. Delirium is potentially reversible with timely intervention. B. Major neurocognitive disorder is a general DSM-5 term for significant cognitive decline from a previous level of functioning. While it indicates severe impairment, it usually develops gradually over months to years, rather than rapidly. C. Vascular dementia results from cerebrovascular disease. Its progression can be stepwise rather than sudden, with cognitive decline occurring gradually after strokes or vascular events. D. Neurocognitive disorder due to Alzheimer’s disease progresses slowly over years. Early stages involve subtle memory loss and cognitive changes, with gradual worsening over time.