D-Glucose and D-Mannose are

Anomers

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Positional isomers

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Functional isomers

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Epimers

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Solution

The correct option is D Epimers
Epimers are a type of stereoisomers which have multiple stereocenters but only differ from one another by configuration at one of the stereogenic centers (chiral carbon centres).
D-Glucose & D-Mannose differ from each other in configuration at $C_{2}$ (second carbon atom). So they are epimers.
Thus, (d) is correct.

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