How does dehydration relate to delirium risk, and what is a typical indicator of adequate hydration in an older adult?

• A. Dehydration decreases delirium risk; adequate hydration indicated by thirst alone.
• B. Hydration status does not affect delirium risk; adequate hydration indicated by blood pressure alone.
• C. Dehydration increases delirium risk; adequate hydration indicated by urine output about 0.5 mL/kg/hr or normal color.
• D. Dehydration has no effect on delirium; urine color is irrelevant.

Answer: (C)