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': 'Derivative of vitelline vein? \nSelect and explain. \nA. IVC, B. SVC, C. Ligamentum venosum, D. Ligamentum teres', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., IVC", 'role': 'assistant'}]