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': "False about poal vein \nSelect and explain. \nA. First 5 cm doesn't give any branches, B. It arises behind pancreatic head, C. It has constant length, D. It is a pa of the hepatic poal system", 'role': 'user'}, {'content': 'Answer: B \nExplanation: The hepatic poal vein is a vessel that moves blood from the spleen and gastrointestinal tract to the liver. It is approximately three to four inches in length and is usually formed by the merging of the superior mesenteric and splenic veins behind the upper edge of the head of the pancreas. ref - BDC 6e vol2 pg282-3', 'role': 'assistant'}]