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
Positive D - xylose test indicates all of the following, Except: 
Select and explain. 
A. Pancreatic insufficiency, B. Small intestinal mucosal disease, C. Impaired carbohydrate absorption in small intestine, D. Malabsorption
A: Pancreatic insufficiency
Answer: A: Pancreatic insufficiency 
Explanation: Answer is A (Pancreatic insufficiency): Pancreatic insufficiency is associated with a Negative D- xylose test (Normal D-xylose excretion)