In kidney disease, which of the following is a common symptom?

Fluid retention is indeed a common symptom of kidney disease. This occurs as the kidneys become less effective at filtering waste and excess fluids from the blood. When the kidneys are not functioning properly, they may struggle to excrete sodium and water, leading to an accumulation of fluids in the body. This results in swelling, particularly in the legs, ankles, and around the eyes, and can also lead to increased blood pressure.

The other symptoms listed do not typically align with the common presentations of kidney disease. Increased energy is usually not associated with kidney dysfunction, as patients often experience fatigue. Weight loss can occur in advanced kidney disease, but it's generally not a primary symptom. Finally, an improved appetite is generally not seen; instead, individuals may experience a loss of appetite as the disease progresses.