Which of the following is a reducing sugar?

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(A) sugar is considered a reducing sugar if it possesses a free $-OH$ group at the anomeric carbon,which allows it to exist in equilibrium with its op

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(A) sugar is considered a reducing sugar if it possesses a free $-OH$ group at the anomeric carbon,which allows it to exist in equilibrium with its open-chain aldehyde or ketone form. This form can then act as a reducing agent. In the provided options,the structure in option $A$ shows a cyclic monosaccharide with a free $-OH$ group at the anomeric carbon,making it a reducing sugar.

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