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': 'Positive D - xylose test indicates all of the following, Except: \nSelect and explain. \nA. Pancreatic insufficiency, B. Small intestinal mucosal disease, C. Impaired carbohydrate absorption in small intestine, D. Malabsorption', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Answer is A (Pancreatic insufficiency): Pancreatic insufficiency is associated with a Negative D- xylose test (Normal D-xylose excretion)', 'role': 'assistant'}]