This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Classification of carbohydrate, Subject name: Biochemistry
Reducing sugar in urine can be detected by 
Select and explain. 
A. Benedicts test, B. Fehling solution, C. Glucose - oxidase test, D. All of the above
D: All of the above
Answer: D: All of the above 
Explanation: All monosaccharides are reducing sugars (functional group is free) Tests include : Benedict's test, Fehling's test, Barfoed's test etc. The reduction is much more efficient in the alkaline medium than in the acid medium.