<prompt> A 46-year-old patient comes to doctors OPD with complains of chest pain and headache. His computed tomography CT scan reveals a tumor located just superior to the root of the right lung. Blood flow in which of the following veins is most likely blocked by this tumor?Hemiazygos veinArch of the azygos veinRight subclan veinRight brachiocephalic vein  <response>: The azygos vein arches over the root of the right lung and empties into the SVC. Other veins do not pass over the root of the right lung. 