In giardiasis malabsorption is due to all except
**Core Concept**
Giardiasis is a parasitic infection caused by Giardia lamblia, leading to malabsorption due to impaired intestinal absorption of nutrients. The pathophysiology involves alterations in the intestinal brush border membrane and decreased activity of brush border enzymes.
**Why the Correct Answer is Right**
Malabsorption in giardiasis occurs due to the attachment of Giardia trophozoites to the intestinal epithelial cells, resulting in damage to the microvilli, decreased surface area for absorption, and reduced activity of enzymes such as lactase, sucrase, and maltase. This impairs the digestion and absorption of carbohydrates, proteins, and fats.
**Why Each Wrong Option is Incorrect**
**Option A:** This option should be completed with a distractor relevant to the context (e.g., "Inhibition of pancreatic enzyme secretion").
**Option B:** This option should be completed with a distractor relevant to the context (e.g., "Impaired bile salt reabsorption").
**Option C:** This option should be completed with a distractor relevant to the context (e.g., "Increased gut motility").
**Clinical Pearl / High-Yield Fact**
The presence of Giardia in the stool can be confirmed by direct fluorescence antibody test (DFAT) or by the presence of trophozoites in a stool smear.
**Correct Answer:**
(Complete the correct answer letter and text based on the question options)