Reducing sugar among these is

Glycogen

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Sucrose

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Lactose

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All the above

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Solution

The correct option is C Lactose
Lactose is a disaccharide formed by the β-1→4 glycosidic linkage between glucose and galactose. It can be broken into galactose and glucose by the enzyme lactase. It has molecular formula of C $_{12}$ H $_{22}$ O $_{11}$ . It is a reducing sugar as it has free OH group on anomeric carbon and it gives the positive test for Fehling's test for reducing sugar.
So, the correct answer is option C.

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