<prompt> A 41-year-old patient presented with chronic diarrhea from last 3 months. A D xylose absorption test will reveal which of the following:Carbohydrate malabsorption due to mucosal disorderCarbohydrate malabsorption due to chronic pancreatitisFat malabsorption due to mucosal disorderFat malabsorption due to chronic pancreatitis  <response>: Ans. A Carbohydrate malabsorption due to mucosal disorderRef: Methods in Disease: Investigating the Gastrointestinal Tract by Victor R Preddy pg. 43 Xylose is a pentose sugar and is absorbed directly from intestinal nucosa. D xylose will reveal carbohydrate malabsorption due to mucosal disorder, but in malabsorption due to pancreatic disease, the D-xylose test should be normal. Due to high false positives and ease of obtaining small intestinal biopsy after endoscopy, intestinal biopsy is the preferred method. 