This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Physiology
[{'content': 'If cirrhosis causes obstruction of the poal circulation within the liver, poal blood could still be conveyed to the caval system which of the following? \nSelect and explain. \nA. Azygos and hemiazygos veins, B. Gonadal veins, C. Internal iliac veins, D. Splenic vein', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Other impoant poacaval connections include the superior rectal vein with the middle and inferior rectal veins; paraumbilical veins and epigastric veins (engorgement of these vessels results in caput-medusae); and the colic and splenic veins with renal veins and veins of the posterior body wall.', 'role': 'assistant'}]