Which is a sign of dehydration in an older adult?

• A. Increased urine output
• B. Dry mucous membranes
• C. Weight gain
• D. Clear skin

Answer: (B)

Dehydration happens when the body lacks enough water, and in older adults the signs can be subtler because thirst sensation may diminish. Dry mucous membranes reflect a real drop in oral moisture from reduced body water, making them a reliable indicator of fluid deficit. When the body is dehydrated, saliva production decreases and the mucosal surfaces in the mouth feel dry, which clinicians notice early and treat promptly.

In contrast, increased urine output would mean more fluid is leaving the body, not less, so it points away from dehydration. Weight gain would suggest excess fluid in the body, not loss. Clear skin usually accompanies good hydration, whereas dehydration can lead to dryness of the skin as well, but dry mucous membranes are a clearer, more specific sign in older adults.