This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Abdomen and pelvis, Subject name: Anatomy
[{'content': 'Inferior mesenteric vein drains into \nSelect and explain. \nA. Splenic vein, B. Renal vein, C. Inferior vena cava, D. Superior mesenteric vein', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Inferior mesenteric vein usually terminates when reaching the splenic vein, which goes on to form the poal vein with the superior mesenteric vein (SMV).', 'role': 'assistant'}]