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': 'True about left renal vein \nSelect and explain. \nA. Posterior and inferior to superior mesenteric aery, B. Posterior and superior to superior mesentric aery, C. Anterior and inferior to superior mesenteric aery, D. Anterior and superior to superior mesentric aery', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Left Renal vein The left renal vein courses between the aoa and superior mesenteric aery to join the inferior vena cava. The left renal vein passes in front of Aoa The left gonadal vein will drain into to left renal vein. The right gonadal vein drains directly into the inferior vena cava. Ref - BDC 6e vol2 pg316', 'role': 'assistant'}]