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
[{'content': 'Which is the following the test of choice for assessment of mucosal function of GIT? \nSelect and explain. \nA. Biopsy, B. Schilling test, C. D-xylose test, D. Small bowel study', 'role': 'user'}, {'content': 'Answer: C \nExplanation: D-Xylose is a carbohydrate which is normally absorbed from the small intestine. Measuring D-xylose level in the serum or its excretion in urine after ingestion, is used for the evaluation of carbohydrate absorption ability of the proximal small intestinal mucosa. Ref: Pocket Guide to Diagnostic Tests By Diana Nicoll, 5th Edition', 'role': 'assistant'}]