Concept:Chirality in biological molecules often arises from the presence of a chiral sugar.
Explanation:DNA contains the sugar
2-deoxy-D-ribose, which is a chiral molecule.
RNA contains the sugar D-ribose, which is also chiral.
Both of these sugars belong to the D-configuration of monosaccharides.
The phosphate group is not chiral under normal conditions.
The nitrogenous base unit is not chiral either.
Therefore, the chirality of DNA and RNA is due to the D-sugar component.
Answer:Option B. D-sugar component