A 55-Year-Old Man Was Admitted to the Hospital Due to the Suspicion

A 55-year-old man was admitted to the hospital due to the suspicion of having sepsis. The patient was diagnosed with pneumonia in a private clinic, 3 days ago. During the previous days, his temperature was not controlled by regular antipyretics. On examination, his blood pressure is 80/50, his pulse is 110/min and regular and his temperature is 40 C. During the evaluation, a central catheter was placed, that passes through the structure indicated by the arrow in the image. What is the origin of this structure?

A) The Truncus Arteriosus
B) The Endodermal Foregut
C) Bulbus Cordis
D) Common Cardinal Veins
E) Subcardinal and supracardinal vein.