**Core Concept**
Mallory bodies, also known as Mallory-Denk bodies, are cytoplasmic inclusions composed of intermediate filament proteins, primarily cytokeratins 8 and 18. They are a hallmark of certain liver conditions and are associated with hepatocyte injury and death.

**Why the Correct Answer is Right**
Mallory bodies are typically seen in conditions that cause hepatocyte damage, such as alcoholic liver disease, non-alcoholic steatohepatitis (NASH), and primary biliary cirrhosis. The formation of Mallory bodies is thought to be a response to oxidative stress and cellular injury, leading to the accumulation of cytokeratins in the cytoplasm. The presence of Mallory bodies is often associated with a poor prognosis and is considered a marker of advanced liver disease.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect as Mallory bodies can indeed be seen in alcoholic liver disease, which is characterized by chronic hepatocyte injury and inflammation.
**Option B:** This option is incorrect as Mallory-Denk bodies are also seen in non-alcoholic steatohepatitis (NASH), a condition that shares many similarities with alcoholic liver disease in terms of hepatocyte injury and inflammation.
**Option C:** This option is incorrect as Mallory bodies are not typically seen in primary sclerosing cholangitis (PSC), a condition that primarily affects the bile ducts and is characterized by chronic inflammation and fibrosis.

**Clinical Pearl / High-Yield Fact**
Mallory bodies are a useful marker of hepatocyte injury and can be seen in a variety of liver conditions, including alcoholic liver disease and NASH. However, their presence is not specific to these conditions, and a comprehensive evaluation of liver function and histology is necessary to determine the underlying cause of liver injury.

**Correct Answer: D. Primary sclerosing cholangitis**