An aldopentose,X,is subjected to a Kiliani-Fischer synthesis to produce two aldohexoses,Y and Z.Both Y and Z,when oxidized with nitric acid,yield optically active aldaric acids.Which structure represents X? 
Definitions:
Reciprocity of Liking
The tendency for individuals to like others who express liking towards them, playing a significant role in the development of friendships and romantic relationships.
Different
Not the same as another or each other; unlike in nature, form, or quality.
Rich
Having an abundance of wealth, resources, or valuable possessions.
Halo Effect
A cognitive bias in which an observer's overall impression of a person, company, brand, or product influences the observer's feelings and thoughts about that entity's character or properties.
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