A 30 year old lady presents with features of malabsorption and iron deficiency anemia. Duodenal biopsy shows complete villous atrophy. Which of the following antibody is likely to be present.
**Core Concept**
The question is testing for the presence of a specific antibody associated with a particular autoimmune condition that causes malabsorption and iron deficiency anemia, as evidenced by complete villous atrophy in the duodenal biopsy.
**Why the Correct Answer is Right**
The presence of complete villous atrophy in the duodenal biopsy suggests an autoimmune condition that targets the small intestine. The most likely antibody associated with this condition is **Tissue Transglutaminase Antibody (TTG)**, which is a marker for Celiac Disease. Celiac Disease is an autoimmune disorder that causes the immune system to react to gluten, leading to inflammation and damage in the small intestine, resulting in malabsorption and iron deficiency anemia.
**Option A:** Anti-endomysial antibody (EMA) is also associated with Celiac Disease, but it is not the primary antibody tested for in this condition.
**Option B:** Anti-saccharomyces cerevisiae antibody (ASCA) is associated with Crohn's disease, which can also cause malabsorption, but the biopsy findings do not support this diagnosis.
**Option C:** Anti-neutrophil cytoplasmic antibody (ANCA) is associated with vasculitis and autoimmune disorders, but it is not directly related to malabsorption or Celiac Disease.
**Option D:** Anti-gliadin antibody (AGA) is associated with Celiac Disease, but it is not as specific as TTG or EMA.
**Clinical Pearl / High-Yield Fact**
Celiac Disease is a common cause of malabsorption and iron deficiency anemia in young adults, and a duodenal biopsy showing complete villous atrophy is a key diagnostic finding.
**Correct Answer:** A. Tissue Transglutaminase Antibody (TTG).