**Core Concept**
Hepatitis B is a viral infection that affects the liver, caused by the hepatitis B virus (HBV). The virus is transmitted through bodily fluids, such as blood and semen, and can lead to acute or chronic liver disease.

**Why the Correct Answer is Right**
Hepatitis B is associated with hepatocellular carcinoma (HCC), a type of liver cancer. The virus integrates into the host cell genome, leading to genetic mutations that can result in cancerous cell growth. Chronic infection with HBV increases the risk of developing HCC, particularly in individuals with cirrhosis or advanced liver disease. The mechanism involves the formation of covalently closed circular DNA (cccDNA) in infected hepatocytes, which serves as a reservoir for viral replication and can lead to liver cancer.

**Why Each Wrong Option is Incorrect**
**Option A:** While hepatitis C is also a liver disease, it is not directly associated with hepatocellular carcinoma in the same way as hepatitis B.
**Option B:** Hepatitis A is a self-limiting disease that typically does not lead to chronic liver disease or cancer.
**Option C:** Hepatitis D is a satellite virus that requires coinfection with hepatitis B to replicate, but it is not a primary cause of hepatocellular carcinoma.

**Clinical Pearl / High-Yield Fact**
Chronic hepatitis B infection is a significant risk factor for hepatocellular carcinoma, and screening for HCC should be performed in patients with chronic HBV infection, particularly those with cirrhosis or advanced liver disease.

**Correct Answer:** D. Hepatitis B is associated with hepatocellular carcinoma.