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: Unknown
Inferior mesenteric vein drains into vein- 
Select and explain. 
A. Splenic, B. Hepatic, C. Portal, D. Inf. vena cava
A: Splenic
Answer: A: Splenic 
Explanation: Splenic