This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Medicine
Which of the following is/are used for assessment of carbohydrate malabsorption: 
Select and explain. 
A. Schilling test, B. Steatorrhoea, C. D-xylose test, D. Glucose test
C: D-xylose test
Answer: C: D-xylose test 
Explanation: Answer- C. D-xylose testD-xylose absorption test is the most commonly employed test for carbohydrate absorption - HarrisonAn endoscopic mucosal biopsy is the more specific test and is now considered essential.D-xylose is a carbohydrate that is absorbed almost exclusively in the proximal small bowel without the help of pancreatic enzymes. A positive D-xylose test indicates malabsorption due to intestinal mucosal disease and thus be used as a test for assessment of mucosal function.