This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Metabolism of carbohydrate, Subject name: Biochemistry
Essential pentosuria is seen in defect of which pathway? 
Select and explain. 
A. HMP shunt, B. Uronic acid pathway, C. TCA cycle, D. Gluconeogenesis
B: Uronic acid pathway
Answer: B: Uronic acid pathway 
Explanation: Essential pentosuria is defect in glucuronic acid pathway of glucose. is an inborn error of metabolism. In the pathway, L-xylulose is conveed to D-xylulose by 2 enzymes, xylitol dehydrogenase, and xylulose reductase. of any of these enzymes leads to pentosuriaRef: DM Vasudevan, 7th edition, page no: 135