This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Anatomy
[{'content': 'Posterior to transverse pericardial sinus? \nSelect and explain. \nA. Aoa, B. Pulmonary trunk, C. SVC, D. Left atrium', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is 'c' i.e., SVC", 'role': 'assistant'}]