**Core Concept**
Banka's lesion is a type of cardiac anomaly involving the atrioventricular (AV) junction, specifically affecting the bundle of His. It is characterized by a congenital abnormality in the AV conduction system.

**Why the Correct Answer is Right**
Banka's lesion is a benign congenital anomaly where the bundle of His is divided into two separate bundles, resulting in delayed conduction through the AV junction. This leads to a prolongation of the PR interval on an electrocardiogram (ECG). The condition is usually asymptomatic and does not require treatment. It is often an incidental finding on a routine ECG.

**Why Each Wrong Option is Incorrect**
**Option A:** Not relevant to the location of Banka's lesion.
**Option B:** Not a recognized cardiac anomaly.
**Option C:** Refers to a different cardiac condition, not related to Banka's lesion.

**Clinical Pearl / High-Yield Fact**
Banka's lesion is often an incidental finding on a routine ECG, and its presence does not necessarily indicate a need for further investigation or treatment. However, it is essential to recognize this condition to avoid misdiagnosis of other cardiac anomalies.

**Correct Answer: C. AV junction**