This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Blood Vessels of Abdomen and Pelvis, Subject name: Anatomy
[{'content': 'Superior rectal vein drains into- \nSelect and explain. \nA. Inferior mesenteric vein, B. External iliac vein, C. Internal iliac vein, D. Internal pudendal vein', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Inferior mesenteric vein o Superior rectal vein drains into inferior mesenteric vein,o Inferior rectal vein drains into internal pudendal vein.", 'role': 'assistant'}]