**Core Concept**
Hyperkalemia is a condition characterized by elevated levels of potassium ions in the blood. Treatment involves various methods to remove excess potassium, including medications and interventions.

**Why the Correct Answer is Right**
To manage hyperkalemia, medications like insulin, beta-2 agonists, and calcium gluconate are used to counteract the effects of potassium on cardiac cells. However, when considering methods to directly remove potassium from the body, medications like polystyrene sulfonate (sodium polystyrene sulfonate) and cation exchange resins are employed.

**Why Each Wrong Option is Incorrect**
**Option A:** Not listed, but for the sake of explanation: Insulin and beta-2 agonists lower potassium levels by driving it into cells, but they do not remove it from the body.
**Option B:** Calcium gluconate is used to stabilize cardiac membranes in the setting of hyperkalemia, but it does not remove potassium from the body.
**Option C:** Not listed, but another correct option might be: Potassium-binding resins like polystyrene sulfonate, which are used to remove potassium from the gastrointestinal tract.
**Option D:** Not listed, but another correct option might be: Hemodialysis, which directly removes potassium from the blood.

**Clinical Pearl / High-Yield Fact**
In hyperkalemia management, it's essential to remember that insulin and beta-2 agonists lower potassium levels by shifting it into cells, whereas polystyrene sulfonate and cation exchange resins remove potassium from the gastrointestinal tract.

**Correct Answer:** C.