Which of the following pairs of monosaccharides form sucrose?
- A$\alpha-D$-galactopyranose and $\alpha-D$-glucopyranose
- B$\alpha-D$-glucopyranose and $\beta-D$-fructofuranose
- C$\beta-D$-glucopyranose and $\alpha-D$-fructopyranose
- D$\alpha-D$-glucopyranose and $\beta-D$-fructopyranose
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