**Core Concept:** Ovarian veins are a pair of veins that drain blood from the ovaries and surrounding tissues into the inferior vena cava (IVC). In the human body, there are two ovarian veins: the right ovarian vein and the left ovarian vein. The left ovarian vein is typically located between the round ligament and the fallopian tube.

**Why the Correct Answer is Right:** The left ovarian vein, along with other pelvic veins, forms the left renal vein, which subsequently enters the IVC. Due to this anatomical arrangement, the correct answer is:

**Correct Answer: C. Left renal vein**

**Why Each Wrong Option is Incorrect:**

A. **Option A (Right Ovarian Vein)**: The right ovarian vein drains into the right renal vein, not the IVC.
B. **Option B (Inferior Vena Cava)**: The left ovarian vein does not directly drain into the IVC, as explained above.
C. **Option D (Left Renal Vein)**: Although the left ovarian vein contributes to the left renal vein, it is incorrect to state that the left ovarian vein drains into the left renal vein. The left ovarian vein merges with the left ureteric vein and other pelvic veins to form the left renal vein, which then enters the IVC.
D. **Option E (Ureter)**: The ureter transports urine from the kidneys to the bladder, while the ovarian veins handle blood return from the ovaries and surrounding tissues.

**Clinical Pearl:** Understanding the drainage patterns of pelvic veins helps in recognizing potential complications like venous thrombosis, which can occur due to conditions like pelvic inflammatory disease, tuberculosis, or malignancies. Proper knowledge of these anatomy and drainage patterns is essential for accurate clinical diagnosis and treatment planning.