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': "The couinaud's segmental nomenclature is based on the position of the - \nSelect and explain. \nA. Hepatic veins and portal vein, B. Hepatic veins and bilary ducts, C. Portal vein and bilary ducts, D. Portal vein and hepatic artery", 'role': 'user'}, {'content': 'Answer: A \nExplanation: Based on the distribution of the portal vein and hepatic vein, couinaud divided functional lobes of liver into eight segments.', 'role': 'assistant'}]