**Question:** All except one are true for hepatitis B -

A. Hepatitis B is caused by the hepatitis B virus (HBV).
B. Hepatitis B can lead to acute or chronic infection.
C. Hepatitis B primarily affects the liver.
D. Hepatitis B infection can cause liver cancer.

**Correct Answer: C (Hepatitis B primarily affects the liver)**

**Core Concept:** Hepatitis B is a viral infection caused by the hepatitis B virus (HBV) and can lead to acute or chronic illness. The disease primarily affects the liver, which is why option C is true. The liver is a crucial organ responsible for detoxification, blood clotting, and maintaining overall body homeostasis.

**Why the Correct Answer is Right:** Hepatitis B primarily affects the liver because the virus primarily targets and infects liver cells, specifically hepatocytes. Once inside the hepatocytes, HBV replicates, leading to inflammation, liver cell damage, and ultimately, liver dysfunction.

**Why Each Wrong Option is Incorrect:**

A. Although Hepatitis B is caused by HBV, the focus on the virus itself neglects the fact that the infection primarily targets and affects the liver.

B. Although Hepatitis B can cause acute or chronic infection, focusing solely on the infection types ignores the primary organ affected, which is the liver.

D. Hepatitis B infection can indeed cause liver cancer (hepatocellular carcinoma), but the primary focus should be on the liver being affected, not the cancer resulting from it.

**Clinical Pearl:** Hepatitis B infection is a serious health concern globally, affecting millions of individuals worldwide. Early diagnosis and treatment are crucial to prevent progression from acute to chronic infection and its associated complications, such as cirrhosis and liver cancer. Always emphasize the importance of understanding the primary organ affected by the infection (liver) when assessing potential patients with hepatitis B symptoms and signs.