Given the structure of a monosaccharide, identify whether it is an aldose or a ketose.

• A. Ketose, because the carbonyl group is at the end of the molecule.
• B. Aldose, because the carbonyl group is in the middle of the molecule.
• C. Aldose, because the carbonyl group is at the end of the molecule.
• D. Ketose, because the carbonyl group is in the middle of the molecule.

Answer: (C)