This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Stomach and aerial supply of abdomen, Subject name: Anatomy
[{'content': 'Veins draining into poal vein are all except: \nSelect and explain. \nA. Renal vein, B. Para umbilical vein, C. Right gastric vein, D. Cystic vein', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Tributaries of Poal vein: Mnemonic: Paraumbilical veins. Right gastric vein. Splenic vein. Superior mesenteric vein. Superior pancreatico-duodenal vein. Left gastric vein.', 'role': 'assistant'}]