ANSWER: Yes, d-mannose and d-galactose are epimers.

An epimer is a type of isomer that differs in the configuration of only one carbon atom in the molecule. In the case of d-mannose and d-galactose, the only difference between the two is the position of the hydroxyl group (OH) on the second carbon atom. In d-mannose, the hydroxyl group is on the right side of the carbon atom, while in d-galactose it is on the left side.

D-mannose and d-galactose are both simple sugars, or monosaccharides, that belong to the family of carbohydrates known as hexoses. They are found in many fruits, vegetables, and other plant-based foods, and are also used as sweeteners and dietary supplements.

Both d-mannose and d-galactose are metabolised by the body and used for energy, but d-mannose has been shown to have specific health benefits for the urinary tract and immune system. D-galactose, on the other hand, is not as well studied and is not commonly used for medicinal purposes.

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