Which of the following are signs of dehydration in elderly patients?

B is the correct choice because it accurately identifies common signs and symptoms of dehydration, particularly in elderly patients. As individuals age, their body's ability to maintain hydration diminishes, making them more susceptible to dehydration.

Dry mucous membranes indicate a lack of moisture, which is a primary symptom of dehydration. Decreased skin turgor refers to the skin's elasticity; when well-hydrated, skin returns to its normal shape quickly after being pinched. In elderly individuals, diminished turgor can be an indicator of fluid loss. Confusion can arise due to the effects dehydration has on cognitive function, as the brain requires adequate hydration to operate effectively.

These signs are critical to recognize, as dehydration can lead to severe complications if not addressed promptly. In contrast, the other options do not reflect signs of dehydration in elderly patients, highlighting why they are less relevant in this context.