In $D-glucose$ $(X)$ and $D-fructose$ $(Y)$,which hydroxyl group participates in hemiacetal/hemiketal formation?
- A$C-5$ in both $X$ and $Y$
- B$C-5$ in $X$ and $C-6$ in $Y$
- C$C-6$ in $X$ and $C-5$ in $Y$
- D$C-4$ in both $X$ and $Y$
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