**Core Concept**
Bronchogenic sequestration is a rare congenital anomaly where a portion of lung tissue receives its blood supply from the systemic circulation rather than the pulmonary circulation. This occurs due to a developmental abnormality during embryogenesis, leading to the formation of a sequestered segment of lung tissue.

**Why the Correct Answer is Right**
Bronchogenic sequestration typically occurs in the lower lobes, with the majority of cases being located in the left lower lobe. The sequestered segment of lung tissue is often supplied by an anomalous systemic artery, which arises from the aorta or its branches. This systemic blood supply is in contrast to the normal pulmonary blood supply, which arises from the pulmonary arteries. The sequestered segment may not be connected to the airways and may not participate in gas exchange, leading to various clinical manifestations such as recurrent infections and hemoptysis.

**Why Each Wrong Option is Incorrect**
**Option B:** Right upper lobe is not a typical location for bronchogenic sequestration, which is more commonly associated with the lower lobes.
**Option C:** Left middle lobe does not exist as a separate entity in the human lung; the left lung has only two lobes, the upper and lower lobes.
**Option D:** Left upper lobe is not a typical location for bronchogenic sequestration, which is more commonly associated with the lower lobes.

**Clinical Pearl / High-Yield Fact**
Bronchogenic sequestration is often associated with other congenital anomalies, such as congenital heart disease and diaphragmatic hernias. A high index of suspicion is required for early diagnosis and management of this condition.

✓ Correct Answer: A. Left lower lobe