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': 'The left adrenal vein drains directly into which of the following veins? \nSelect and explain. \nA. Hemiazygos vein, B. Inferior vena cava, C. Left renal vein, D. Splenic vein', 'role': 'user'}, {'content': "Answer: C \nExplanation: In contrast, the right adrenal vein and right gonadal vein drain directly into the inferior vena cava. Ref ganong's review of medical physiology 25e", 'role': 'assistant'}]