This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: G.I.T, Subject name: Medicine
Best Test for intestinal malabsorption - 
Select and explain. 
A. D-xylose test, B. NBT-PABATEST, C. Fecal fatestimation, D. Schilling test
A: D-xylose test
Answer: A: D-xylose test 
Explanation: D-xylose absorption test is a medical test performed to diagnose conditions that present with malabsorption of the proximal small intestine due to defects in the integrity of the gastrointestinal mucosa. D-xylose is a monosaccharide, or simple sugar, that does not require enzymes for digestion prior to absorption Ref Davidson edition23rd pg 809