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': 'The poal vein is derived from which of the following? \nSelect and explain. \nA. Vitelline veins, B. Umbilical veins, C. Anterior cardinal veins, D. Posterior cardinal veins', 'role': 'user'}, {'content': 'Answer: A \nExplanation: The poal vein is derived from :- Major contribution from Right vitelline vein Minor contribution from left vitelline vein Dorsal anastmosis between left and right vitelline vein (NOTE - vitelline of each side are connected to each other by proximal , middle and distal anastmosis )', 'role': 'assistant'}]