This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Galactose and fructose metabolism, Subject name: Biochemistry
[{'content': 'Essential pentosuria is due to deficiency of: \nSelect and explain. \nA. Fructokinase, B. Phosphoglucomutase, C. Xylulose reductase, D. Gluonolactone oxidase', 'role': 'user'}, {'content': "Answer: C \nExplanation: Essential Pentosuria: Occurs due to deficiency of : Xylulose reductase Xylitol dehydrogenase. L-Xylulose in urine, gives positive Benedict's test Glucose Oxidase test strip negative Garrod's Tetrad Pentosuria, Albinism, Alkaptonuria, Cystinuria) Due to consumption of large amount of fruits that are rich in Pentoses Fructokinase deficiency causes essential fructosuria, not essential pentosuria", 'role': 'assistant'}]