**Core Concept**
Tall peaked T waves on an ECG are indicative of hyperkalemia, a condition characterized by elevated potassium levels in the blood. This alteration in the ECG pattern is a result of the effect of potassium on the cardiac membrane potential.

**Why the Correct Answer is Right**
Tall peaked T waves are a classic ECG finding in hyperkalemia. The increased potassium levels affect the cardiac action potential, specifically during the repolarization phase, leading to the characteristic peaked T wave morphology. **Sodium-potassium pump (Na+/K+-ATPase)** activity is impaired in hyperkalemia, allowing potassium ions to accumulate within the cardiac cells and alter the membrane potential. This results in the abnormal ECG pattern.

**Why Each Wrong Option is Incorrect**
* **Option A:** Administering calcium gluconate is a treatment for hyperkalemia, but it does not address the underlying cause of tall peaked T waves. Calcium can help stabilize the cardiac membrane, but it does not resolve the hyperkalemia.
* **Option B:** Insulin therapy is used to manage hyperkalemia by promoting the uptake of potassium into cells. However, it does not directly affect the ECG pattern of tall peaked T waves.
* **Option D:** Potassium-binding resins are used to treat hyperkalemia by removing excess potassium from the body. While effective in managing hyperkalemia, they do not directly address the ECG finding of tall peaked T waves.

**Clinical Pearl / High-Yield Fact**
Remember the "HEARTS" mnemonic to identify the ECG changes associated with hyperkalemia: Hyperkalemia leads to Elevation of the PR interval, Atrial fibrillation, Abnormal QRS complex, Tall peaked T waves, and ST segment depression.

**Correct Answer: C. Insulin and glucose.**