**Core Concept**
A Klatskin tumor is a type of cholangiocarcinoma that occurs at the junction of the right and left hepatic bile ducts, near the porta hepatis. This rare tumor is named after Dr. Ralph Klatskin, who first described it in 1965. Klatskin tumors often present with obstructive jaundice and can be challenging to diagnose and treat.

**Why the Correct Answer is Right**
Klatskin tumors arise from the epithelial cells of the bile ducts and can be associated with primary sclerosing cholangitis, hepatitis B or C, or other risk factors. The tumor's location near the bifurcation of the hepatic bile ducts makes it difficult to resect surgically, and treatment often involves a combination of surgery, chemotherapy, and radiation therapy. The histopathological diagnosis of Klatskin tumor is typically made by biopsy and examination of the tumor cells under a microscope.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not specifically refer to a tumor at the junction of the right and left hepatic bile ducts.

**Option B:** This option is incorrect because it does not accurately describe the location of a Klatskin tumor.

**Option C:** This option is incorrect because it refers to a different type of tumor altogether.

**Clinical Pearl / High-Yield Fact**
Klatskin tumors are a classic example of a bile duct tumor that can present with obstructive jaundice and is often challenging to diagnose and treat. A high index of suspicion and a thorough evaluation, including imaging studies and biopsy, are essential for making a diagnosis.

**Correct Answer:** Not provided. Please provide the correct answer options.