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 fructosuria is due to deficiency of 
Select and explain. 
A. b-galactosidase, B. Aldolase-B, C. Fructokinase, D. Aldose reductase
C: Fructokinase
Answer: C: Fructokinase 
Explanation: Fructosuria is a benign metabolic defect due to deficiency of fructokinase. There is no abnormality in other than excretion of fructose in urine.Ref: DM Vasudevan, 7th edition, page no: 138