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': 'True about left renal vein - \nSelect and explain. \nA. Posterior and inferior to Superior mesenteric artery, B. Posterior and superior to superior mesenteric artery, C. Anterior and inferior to Superior mesenteric artery, D. Anterior and superior to Superior mesenteric artery', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]