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
[{'content': 'Poo-caval anastomosis is seen between: \nSelect and explain. \nA. In the rectum: superior rectal vein and inferior rectal vein, B. At the umbilicus: poal vein and accessory hemiazyogs vein, C. At the esophagus: left gastric vein and paraumbilical vein, D. At the liver: poal vein & renal azygos vein', 'role': 'user'}, {'content': 'Answer: A \nExplanation: A i.e. In the rectum - superior rectal vein & inferior rectal vein', 'role': 'assistant'}]