This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Carbohydrates, Subject name: Biochemistry
[{'content': 'A 3-year-old girl has been a fussy eater since being weaned, particularly when fruit is part of her diet. She would get cranky, sweat, and display dizziness, and lethargy, after eating a meal with fruit. Her mother noticed this correlation, and as long as fruit was withdrawn from her diet, the child did not display such symptoms. The problems the girl exhibits when eating fruit is most likely due to which one of the following? \nSelect and explain. \nA. Decreased levels of fructose in the blood, B. Elevated levels of glyceraldehyde in liver cells, C. High levels of sucrose in the stool, D. Elevated levels of fructose-1-phosphate in liver cells', 'role': 'user'}, {'content': 'Answer: D \nExplanation: The patient has HFI, which is caused by a mutation in aldolase B. Sucrose would still be cleaved by sucrase; thus, it would not increase in the stool. Fructose would not be metabolized normally; therefore, it would be elevated in the blood and urine. Aldolase B would not cleave fructose-1-phosphate; thus, its levels would be elevated, and the product, glyceraldehyde, would not be produced.', 'role': 'assistant'}]