This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General anatomy, Subject name: Anatomy
[{'content': 'Renal pa of inferior vana cava develops from? \nSelect and explain. \nA. Vitelline vein, B. Subcardinal vein, C. Supracardinal vein, D. Common cardinal vein', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]