The diagrams show two monosaccharides that share the same molecular formula $(\text{C}_6\text{H}_{12}\text{O}_6)$. As illustrated, each may occur in either an alpha $(\alpha)$ or beta $(\beta)$ form. The diagram also indicates a lactose molecule produced by condensation between glucose and galactose. Which molecules have condensed to make lactose?
- A$\alpha$-glucose and $\alpha$-galactose
- B$\alpha$-glucose and $\beta$-galactose
- C$\beta$-glucose and $\alpha$-galactose
- D$\beta$-glucose and $\beta$-galactose