Which of the following compounds is categorized as a hepatotoxin?

• A. Mercury
• B. Carbon monoxide
• C. Alcohol
• D. Benzene

Answer: (C)

A hepatotoxin is a substance that specifically damages the liver. When considering the compounds listed, alcohol is well-known for its hepatotoxic effects. Chronic consumption of alcohol can lead to liver inflammation, fatty liver disease, alcoholic hepatitis, and ultimately cirrhosis. The liver metabolizes alcohol, and excessive amounts can overwhelm its ability to process it, resulting in toxic effects on liver cells.

Mercury, while harmful, primarily affects the nervous system and kidneys rather than being classified mainly as a hepatotoxin. Carbon monoxide is a toxic gas that affects the body's ability to transport oxygen, leading to severe health effects but does not primarily target the liver. Benzene is an industrial chemical that poses risks, primarily affecting the blood and bone marrow, contributing to various blood cancers.

Thus, alcohol's direct and damaging impact on liver cells categorizes it clearly as a hepatotoxin, making it the correct choice in this context.