Final answer:
The left testicular vein empties into the left renal vein, contrasting with the right testicular vein, which drains directly into the inferior vena cava.
Step-by-step explanation:
The left testicular vein is an important vascular structure in the male reproductive system, draining the testes and forming part of the spermatic cord. The anatomical route of the left testicular vein is distinct from that of the right. While the right testicular vein empties directly into the inferior vena cava (IVC), the left testicular vein has a different pathway, draining into the left renal vein. This vascular arrangement is mirrored by the ovarian veins in females, where the left ovarian vein also drains into the left renal vein. In summary, the left testicular vein empties into the left renal vein, making 'B. Left renal' the correct answer to the student's question.