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S-glyceraldehyde is also known L-glyceraldehyde.

The conflguration of the stereocenter most distant from the carbonyl group determines whether a monosaccharide is D or L.

Glucose and all naturally occurring sugars are D-sugars.

Dverythrose and D-threose are diastereomer.•.

answer is A.

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Detailed Solution

L-glyceraldehyde and S-glyceraldehyde are synonyms.
D isomers are sugars that are found in nature. Because they all contain a hydroxy group linked to the right of the last, all D sugars are R isomers.
The absolute configuration of the asymmetric carbon on the monosaccharide that is furthest from the ketone or aldehyde group is represented by the L and D conformations. On the Fischer projection, a sugar is categorised as a D sugar if the furthest hydroxyl(-OH) group is on the right and a L sugar if the hydroxyl group is on the left.

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