**Core Concept**
The question is testing the student's knowledge of intestinal parasites that can cause malabsorption. Malabsorption occurs when the small intestine is unable to absorb nutrients from food, leading to deficiencies and related complications.

**Why the Correct Answer is Right**
Hookworm infestation leads to malabsorption through chronic blood loss and intestinal damage. Hookworms attach to the intestinal mucosa, causing erosion and inflammation, which impairs the absorptive function of the small intestine. This results in malabsorption of essential nutrients, including vitamins and minerals. The chronic blood loss also leads to iron deficiency anemia, a common complication of hookworm infestation.

**Why Each Wrong Option is Incorrect**
**Option A:** Tapeworm infestation (e.g., Diphyllobothriasis) primarily leads to vitamin B12 deficiency and weight loss, but it does not cause significant malabsorption of other nutrients.
**Option B:** Roundworm infestation (Ascaris lumbricoides) can cause intestinal obstruction, but it is not typically associated with malabsorption.
**Option C:** Pinworm infestation (Enterobius vermicularis) is primarily a cause of anal itching and does not lead to malabsorption.

**Clinical Pearl / High-Yield Fact**
It is essential to diagnose and treat hookworm infestation promptly to prevent long-term consequences, including iron deficiency anemia, malnutrition, and impaired cognitive development.

**Correct Answer: C. Hookworm infestation can lead to malabsorption of essential nutrients and chronic blood loss, resulting in iron deficiency anemia.**