The correct option is
A Lung
In human anatomy, an azygos lobe is a congenital variation of the upper lobe of the right lung. Embryologically, it arises from an anomalous lateral course of the azygos vein in a pleural septum within the upper lobe. As it has no bronchi, veins, and arteries of its own, it is not a true, or even accessory pulmonary lobe, but rather an anatomically separated part of the upper lobe.
So, the correct answer is option A.