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
The left adrenal vein drains directly into which of the following veins? 
Select and explain. 
A. Hemiazygos vein, B. Inferior vena cava, C. Left renal vein, D. Splenic vein
C: Left renal vein
Answer: C: Left renal vein 
Explanation: 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