Sequestrated lobe of the lung is commonly supplied by
**Core Concept**
The question tests the understanding of **pulmonary anatomy** and **vascular supply** to the lungs, specifically in the context of a sequestrated lung lobe. A sequestrated lobe refers to a portion of the lung that is not connected to the normal **tracheobronchial tree** and receives its blood supply from an anomalous source.
**Why the Correct Answer is Right**
A sequestrated lobe of the lung is commonly supplied by the **systemic arteries**, which are part of the **aorta** or its branches, rather than the **pulmonary arteries**. This anomalous blood supply is a key characteristic of lung sequestration. The systemic arteries provide oxygenated blood to the sequestrated lobe, which can lead to various clinical issues.
**Why Each Wrong Option is Incorrect**
**Option A:** Incorrect because it is not the typical description of the blood supply to a sequestrated lung lobe.
**Option B:** Incorrect as it does not accurately represent the anomalous blood supply seen in lung sequestration.
**Option C:** Incorrect because, although related to lung anatomy, it does not correctly describe the blood supply to a sequestrated lobe.
**Clinical Pearl / High-Yield Fact**
Lung sequestration is a rare condition that can present with **recurrent pneumonia** or **hemoptysis** due to the abnormal blood supply. Recognizing the systemic arterial supply to a sequestrated lung lobe is crucial for diagnosis and treatment.
**Correct Answer:** D. systemic arteries.