Which of the following can be classified as an oligosaccharide?
Galactose
Glyceraldehyde
Sucrose
Fructose
As we have learnt,
Oligosaccharides are carbohydrates that give 2-10 molecules of monosaccharides upon hydrolysis. Galactose, glyceralddehyde and fructose are all monosaccharides while sucrose is an Oligosaccharide as it gives glucose and fructose upon hydrolysis.
Hence, the correct answer is Option (3)