When might someone need a dialysis procedure?

Dialysis is a medical procedure specifically designed to assist individuals whose kidneys are unable to perform their normal filtration functions. The kidneys are responsible for removing waste products and excess fluids from the blood, balancing electrolytes, and regulating blood pressure. When the kidneys fail or are severely impaired due to conditions such as chronic kidney disease, acute kidney injury, or other related disorders, dialysis becomes a necessary intervention. This process artificially removes toxins and waste from the bloodstream, mimicking the natural function of healthy kidneys.

In this case, since the scenario involves renal function, the answer related to the kidneys being unable to filter waste properly is the most accurate. The other options pertain to different medical conditions and do not relate directly to kidney function or the necessity for dialysis. Skin infections, high cholesterol, and dehydration are managed through other treatments rather than dialysis, making them unsuitable options in the context of kidney failure and the need for waste filtration.