Which of the following sugars is an epimer of glucose?

A Mannose
B Galactose
C Fructose
D Ribose
Galactose is an epimer of glucose, differing only in the orientation of the hydroxyl group at the C-4 position.
Biochemistry textbooks
Carbohydrate Metabolism Biochemistry Monosaccharide Structure and Function Hard MEDICAL Confidence: high