Arsenic causes
**Core Concept**
Arsenic is a toxic metalloid that exerts its effects through various mechanisms, primarily by disrupting cellular metabolism and inducing oxidative stress. Prolonged exposure to arsenic can lead to severe health consequences, including skin lesions, cardiovascular disease, and cancer. The toxic effects of arsenic are mediated by its ability to bind to sulfhydryl groups, leading to the inhibition of various enzymes and proteins.
**Why the Correct Answer is Right**
The correct answer is related to the ability of arsenic to cause oxidative stress and damage to cellular components. Arsenic can bind to glutathione, a crucial antioxidant that protects cells from oxidative damage, thereby leading to an accumulation of reactive oxygen species (ROS). This can cause DNA damage, protein denaturation, and lipid peroxidation, ultimately resulting in cell death and tissue damage. The arsenic-induced disruption of cellular metabolism can also lead to the inhibition of key enzymes involved in energy production, such as pyruvate dehydrogenase and alpha-ketoglutarate dehydrogenase.
**Why Each Wrong Option is Incorrect**
**Option A:** Arsenic causes anemia.
* This option is incorrect because while arsenic can lead to various health consequences, anemia is not a direct or primary effect of arsenic exposure.
**Option B:** Arsenic causes acute renal failure.
* This option is incorrect because while arsenic can cause kidney damage, acute renal failure is not a typical or immediate consequence of arsenic exposure.
**Option C:** Arsenic causes Parkinson's disease.
* This option is incorrect because while arsenic can lead to neurological symptoms, Parkinson's disease is not a direct or primary effect of arsenic exposure.
**Clinical Pearl / High-Yield Fact**
Arsenic exposure can be prevented by avoiding the consumption of contaminated water and food, particularly in areas where arsenic levels are high. The World Health Organization (WHO) recommends the use of arsenic removal technologies to reduce arsenic levels in drinking water.
**Correct Answer: D.**