Explanation

(b)
$C_{1}$ carbon of monosaccharides is called anomeric carbon. When the $–OH$ group attached with $C_{1}$ carbon is towards right, it is called $\alpha -$from and when the $–OH$ group is towards left, it is called $\beta -$from. Such pair of optical isomers which differ in the configuration only around anomertic carbon are called anomers.
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