This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Thorax, Subject name: Anatomy
[{'content': 'What lies anterior to transverse sinus \nSelect and explain. \nA. Aoa, B. Pulmonary aery, C. IVC, D. SVC', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Transverse sinus is a horizontal gap between the aerial and venous ends of the hea tube.It is bounded anteriorly by the ascending aoa and pulmonary trunk,and posteriorly by the superior venacava and inferiorly by the left atrium.On each side it opens into the general pericardial cavity. <img src=" /> REF:B D CHAURASIA\'S HUMAN ANATOMY,VOLUME-1,FIFTH EDITION Page no 242', 'role': 'assistant'}]