This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Abdomen & Pelvis, Subject name: Anatomy
Normal splanchnic blood supply of the liver includes- 
Select and explain. 
A. Portal vein, B. Splenic artery, C. Superior mesenteric artery, D. Inferior mesenteric vein
A: Portal vein
Answer: A: Portal vein 
Explanation: Ans. is 'a' i.e., Portal vein * Liver has dual blood supply and receives 20% of its blood supply through hepatic artery (systemic) and 80% through portal vein (splanchnic). Portal vein is formed by union of splenic vein and superior mesenteric veins.* Venous drainage is through hepatic veins into IVC.