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': 'Sinus venosus receiver blood from all except \nSelect and explain. \nA. Vitelline vein, B. Umbilical vein, C. Common cardinal vein, D. Sub cardinal vein', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Each horn of sinus venosus receives blood from following three pair of veins, vetelline veins (from yolk sac), umbitical veins (from placenta) and common caralinal veins (from body wall).', 'role': 'assistant'}]