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': 'The veins of the pericardium drain into \nSelect and explain. \nA. Superior vena cava, B. Inferior vena cava, C. Azygos vein, D. Left brachiocephalic vein', 'role': 'user'}, {'content': 'Answer: A \nExplanation: The veins of pericardium drains into svc, pierced anteriorly . Ref - BDC 6th edition vol 1 pg 272', 'role': 'assistant'}]