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
[{'content': 'Posterior to transverse pericardial sinus is: \nSelect and explain. \nA. Aoa, B. Pulmonary trunk, C. SVC, D. Left atrium', 'role': 'user'}, {'content': 'Answer: C \nExplanation: * 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 .', 'role': 'assistant'}]