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
What is the enzyme involved in the following conversion: 
Select and explain. 
A. Sorbitol dehydrogenase, B. Glucose reductase, C. Aldose reductase, D. Glucose oxidase
C: Aldose reductase
Answer: C: Aldose reductase 
Explanation: Monosaccharides get conveed to their respective alcohols on reduction. Glucose gets conveed to its alcohol i.e. Sorbitol. Galactose conveed to its alcohol i.e. galactitol. In both cases, a common enzyme is used i.e. Aldose Reductase.