Which of the following D-aldoses will produce an optically inactive product when treated with NaBH4/H2O? 
Definitions:
Molecules
The smallest units of a chemical substance that can exist independently while retaining the composition and chemical properties of the substance.
Anatomical Position
The standard position in which the body is standing with feet together, arms at the side, and head, eyes, and palms facing forward, used as a reference point in anatomical nomenclature.
Organs of Digestion
The series of organs responsible for breaking down food and absorbing nutrients, including the stomach, intestines, liver, and pancreas.
Abdominal Cavity
The part of the body that lies between the thorax (chest) and pelvis, housing many vital organs such as the stomach, liver, and intestines.
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