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
Posterior to transverse pericardial sinus is: 
Select and explain. 
A. Aoa, B. Pulmonary trunk, C. SVC, D. Left atrium
C: SVC
Answer: C: SVC 
Explanation: * Transverse pericardial sinus lies between the aoa and pulmonary trunk anteriorly and the superior vena cava posteriorly. Boundaries :- Below-left atrium Above - bifurcation of pulmonary trunk Behind(posterior)- superior vena cava In front- ascending aoa and pulmonary trunk * Clinically, in cardiac surgery, temporary ligature or clamp is passed through transverse pericardial sinus to stop or dive the circulation of blood in large aeries .