This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: CVS Embryology, Subject name: Anatomy
The structure present anterior to transverse pericardial sinus is 
Select and explain. 
A. Inferior vena cava, B. Superior vena cava, C. Aoa, D. Pulmonary aery
C: Aoa
Answer: C: Aoa 
Explanation: Transverse sinus is a horizontal gap between the aerial and venous ends of the hea tube, it is bound Anteriorly: ascending aoa, pulmonary trunk Posteriorly: SVC Inferiorly: L. atrium On each side it opens into the general pericardial cavity. Oblique sinus is a narrow gap behind the hea. It is bound anteriorly : L. atrium posteriorly: R. parietal pericardium, oesophagus.