رجل عمره ٧٨ سنة منوّم بالتهاب رئوي، صار فجأة خلال ليلة مشوش ويتكلم كلام غير مفهوم ويشد المحلول. أهله يقولون إنه كان طبيعي أمس. ما الأرجح؟

A 78-year-old man admitted with pneumonia becomes confused overnight, mumbles and pulls at his IV. His family says he was normal yesterday. What is most likely?

1. Severe late-life depression
2. Delirium
3. Late-onset schizophrenia
4. Advanced Alzheimer dementia

Answer: B) Delirium. Sudden onset over hours, fluctuating awareness and a physical cause such as infection indicate delirium, which is reversible if the cause is treated; dementia progresses slowly.