**Core Concept:** Triggered automaticity is a phenomenon where a spontaneously active cell is excited by an extrinsic stimulus, leading to the development of an ectopic beat or rhythm disorder. This concept is important in understanding the pathogenesis of various arrhythmias.

**Why the Correct Answer is Right:** Option C, Ventricular Tachycardia (VT), is a rhythm disorder that can be initiated by triggered automaticity. In VT, multiple adjacent ventricular cells fire in a coordinated manner, resulting in rapid ventricular contractions. This can be triggered by ectopic beats or re-entry mechanisms.

**Why Each Wrong Option is Incorrect:**

A. Atrial Tachycardia (AT): Triggered automaticity mainly affects ventricular tissue, not atrial tissue. AT is a tachycardia initiated by automaticity within the atria.

B. Atrioventricular Nodal Reentrant Tachycardia (AVNRT): This is a re-entry mechanism involving the atrioventricular node and adjacent tissue, not triggered automaticity.

D. Ventricular Fibrillation (VF): VF is a chaotic, irregular cardiac rhythm without a recognizable pattern, distinct from triggered automaticity which results in a regular rhythm disorder like VT.

**Clinical Pearl / High-Yield Fact:** Understanding triggered automaticity is crucial in the management of patients experiencing life-threatening arrhythmias like VT or VF. Targeted pharmacological therapies like beta-blockers and calcium channel blockers can be used to suppress triggered automaticity in specific scenarios.

**Correct Answer:** C. Ventricular Tachycardia (VT)