Microcytic hypochromic anemia found in infestation of-a) Ankylostomab) Ascarisc) Necatord) Diphyllobothrium

**Core Concept**
Microcytic hypochromic anemia is characterized by small (microcytic) and pale (hypochromic) red blood cells, resulting from a reduction in the production of hemoglobin or red blood cell mass. This type of anemia is often associated with iron deficiency, but it can also be caused by other factors such as thalassemia or lead poisoning.

**Why the Correct Answer is Right**
The correct answer is related to the pathophysiology of anemia caused by blood loss. Hookworm infestation (Ankylostoma) leads to chronic blood loss, which can result in iron deficiency anemia. This is because the hookworm attaches to the intestinal mucosa and ingests blood, leading to a gradual loss of iron and other essential nutrients. Over time, this can lead to microcytic hypochromic anemia.

**Why Each Wrong Option is Incorrect**
* **Option B:** Ascaris infestation is associated with large intestine obstruction, malabsorption, and occasionally, intestinal rupture, but it is not typically associated with microcytic hypochromic anemia.
* **Option C:** Necator americanus is another type of hookworm, similar to Ankylostoma, and would also cause microcytic hypochromic anemia due to chronic blood loss.
* **Option D:** Diphyllobothrium is a type of tapeworm that can cause vitamin B12 deficiency anemia, but it is not typically associated with microcytic hypochromic anemia.

**Clinical Pearl / High-Yield Fact**
Hookworm infestation can lead to a range of complications, including iron deficiency anemia, protein-energy malnutrition, and even intestinal obstruction.

**Correct Answer:** A. Ankylostoma