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': 'A 56 year-old male was brought to the emergency depament with severe pain in the left flank region. CT-examination revealed occlusion of the left renal vein. The condition would impede the blood flow through all the following veins except: \nSelect and explain. \nA. Left Adrenal vein, B. Left testicular vein, C. Diaphragmatic vein, D. Left subcostal vein', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Left subcostal vein doesnot drain into the left renal vein. Veins that commmonly drain into the renal vein (which in turn drains into the IVC) Left inferior phrenic (diapgragmatic) vein, Left suprarenal (adrenal) vein, Left gonadal vein On the right side, all the above veins drain into the inferior vena cava directly. Apa from the veins described above, the first and second left lumbar veins and hemiazygous vein may drain into the left renal vein. Ref: Gray&;s Anatomy 41st edition Pgno: 1091, 1246', 'role': 'assistant'}]