Which of the following is a nephrotoxicant?

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

Answer: (B)

Mercury is classified as a nephrotoxicant due to its harmful effects on the kidneys. When mercury enters the body, it can accumulate in the renal tissues and lead to kidney damage, affecting their ability to filter blood and excrete waste products. The toxicological impact of mercury can result in acute or chronic kidney injury, manifesting as proteinuria, reduced kidney function, and potentially leading to kidney failure in severe cases.

In contrast, while the other options—alcohol, carbon monoxide, and benzene—can be harmful to numerous organs and systems in the body, they do not specifically target the kidneys in the same way that mercury does. Alcohol is more well-known for its hepatotoxic effects on the liver, carbon monoxide primarily affects the respiratory and cardiovascular systems, and benzene is linked with hematological toxicities affecting blood production rather than direct nephrotoxicity.