**Core Concept**
Obstruction of the **Inferior Vena Cava (IVC)** is a condition where the flow of blood through the IVC is blocked, leading to **thrombosis** and **edema**. This condition can be caused by various factors, including **thrombosis**, **tumors**, and **trauma**. The IVC is a major vein that carries deoxygenated blood from the lower body to the heart.

**Why the Correct Answer is Right**
The correct answer is related to the presentation of IVC obstruction, which typically includes **edema** of the lower limbs, **ascites**, and **varicose veins**. The obstruction of the IVC leads to increased pressure in the veins of the lower body, causing fluid to leak into the tissues and resulting in **edema**. The increased pressure also causes the formation of **varicose veins** and **ascites**.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it is not a typical presentation of IVC obstruction.
**Option B:** This option is incorrect because it is not a direct result of IVC obstruction.
**Option C:** This option is incorrect because it is not a common symptom of IVC obstruction.
**Option D:** This option is incorrect because it is not a typical presentation of IVC obstruction.

**Clinical Pearl / High-Yield Fact**
A key point to remember is that IVC obstruction can be caused by **malignancy**, such as **renal cell carcinoma**, and can also be a complication of **deep vein thrombosis**.

**Correct Answer:** D. Edema of lower limb