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
Superior rectal vein drains into? 
Select and explain. 
A. Inferior mesenteric vein, B. External iliac vein, C. Internal iliac vein, D. Internal pudendal vein
A: Inferior mesenteric vein
Answer: A: Inferior mesenteric vein 
Explanation: Ans. is 'a' i.e., Inferior mesenteric veinSuperior rectal vein drains into inferior mesenteric vein.Inferior rectal vein drains into internal pudendal vein.