This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Bronchopulmonary Segments, Embryonic veins, Subject name: Anatomy
[{'content': 'Posterior cardinal vein develops into: \nSelect and explain. \nA. Superior vena cava, B. Internal jugular vein, C. External jugular vein, D. Common iliac vein', 'role': 'user'}, {'content': 'Answer: D \nExplanation: -Right Posterior cardinal veins contribute to inferior vena cava and common iliac veins. Left anterior and Left posterior cardinal veins regress - Superior vena cava and jugular veins develop from anterior cardinal veins.', 'role': 'assistant'}]