**Core Concept**
The bronchopulmonary segment is a functional unit of the lung, consisting of a bronchus, its accompanying pulmonary artery and veins, and the surrounding lung tissue. It is supplied by a segmental bronchus and its corresponding segmental pulmonary artery.

**Why the Correct Answer is Right**
The bronchopulmonary segment is supplied by a segmental branch of the pulmonary artery, which arises from the lobar or segmental branches of the pulmonary artery. The segmental bronchus, which provides air to the segment, accompanies the segmental pulmonary artery and is responsible for gas exchange. The segmental pulmonary vein also drains the segment. The segmental supply allows for independent ventilation and perfusion of each segment, which is crucial for maintaining lung function.

**Why Each Wrong Option is Incorrect**
* **Option A:** This is not a correct option as it does not provide a specific answer.
* **Option B:** This option is incorrect as it does not specify the correct blood supply to the bronchopulmonary segment.
* **Option C:** This is not a correct option as it does not provide a specific answer.
* **Option D:** This option is incorrect as it does not specify the correct blood supply to the bronchopulmonary segment.

**Clinical Pearl / High-Yield Fact**
Each bronchopulmonary segment has a unique bronchial and vascular supply, allowing for independent ventilation and perfusion. This is crucial for understanding lung anatomy and function, particularly in the context of lung surgery and disease.

**Correct Answer:** A. Segmental branch of the pulmonary artery.