**Core Concept**
Torsades de Pointes (TdP) is a specific type of abnormal heart rhythm characterized by a rapid, irregular heartbeat. It is a serious cardiac arrhythmia that can be life-threatening if not treated promptly.

**Why the Correct Answer is Right**
Torsades de Pointes is often caused by prolongation of the QT interval, which can be due to various factors such as genetic mutations, electrolyte imbalances (e.g., hypokalemia), or the use of certain medications like class IA and III antiarrhythmics. These medications can interfere with the normal functioning of the heart's electrical system, leading to a prolonged QT interval and an increased risk of TdP.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not specify a medication class associated with QT prolongation and TdP.
**Option B:** This option is incorrect because it does not accurately describe the pathophysiology of TdP.
**Option C:** This option is incorrect because it does not mention the specific mechanism of QT prolongation.

**Clinical Pearl / High-Yield Fact**
A key clinical pearl to remember is that medications that prolong the QT interval can increase the risk of Torsades de Pointes, and patients with a history of TdP or a family history of long QT syndrome should be carefully evaluated before starting these medications.

**Correct Answer:** C. Class III antiarrhythmics (e.g., sotalol, amiodarone) are known to prolong the QT interval and increase the risk of Torsades de Pointes.