**Core Concept**
Left-sided portal hypertension is characterized by increased pressure in the portal vein due to obstruction of blood flow, often caused by splenic vein thrombosis or other diseases affecting the splenic vein or liver. This condition can lead to severe complications such as gastric varices and splenomegaly.

**Why the Correct Answer is Right**
The correct treatment for left-sided portal hypertension involves addressing the underlying cause. In cases of splenic vein thrombosis, splenectomy is often the most effective option to alleviate symptoms and prevent further complications. This surgical procedure involves removing the spleen, which can help reduce portal pressure and prevent the formation of gastric varices.

**Why Each Wrong Option is Incorrect**
**Option A:** TIPS (Transjugular Intrahepatic Portosystemic Shunt) is not the best option for left-sided portal hypertension as it may not effectively address the underlying cause of splenic vein thrombosis.
**Option B:** Endoscopic variceal ligation is a treatment for gastric varices, but it does not address the underlying cause of left-sided portal hypertension.
**Option C:** Liver transplantation is not typically required for left-sided portal hypertension, as the liver itself is not directly affected.

**Clinical Pearl / High-Yield Fact**
When considering treatment for left-sided portal hypertension, it is essential to identify and address the underlying cause, as this will determine the most effective treatment approach.

**Correct Answer:** C. Splenectomy.