Task: Class Definition Understanding (ontology: Sciences/Biology)

Which of the following definitions best describes ''de novo' NAD biosynthetic process from L-aspartate'?

A. The chemical reactions and pathways resulting in the breakdown of glutamate into other compounds, including aspartate.
B. Any process that activates or increases the frequency, rate or extent of translation initiation as a result of a stimulus indicating the organism is under stress.
C. The chemical reactions and pathways resulting in the formation of nicotinamide adenine dinucleotide (NAD), beginning with the catabolism of L-tryptophan into the precursor quinolinate; biosynthesis may be of either the oxidized form, NAD+, or the reduced form, NADH.
D. The chemical reactions and pathways resulting in the formation of nicotinamide adenine dinucleotide (NAD), beginning with the catabolism of L-aspartate into the precursor quinolinate; biosynthesis may be of either the oxidized form, NAD, or the reduced form, NADH.

Answer: The chemical reactions and pathways resulting in the formation of nicotinamide adenine dinucleotide (NAD), beginning with the catabolism of L-aspartate into the precursor quinolinate; biosynthesis may be of either the oxidized form, NAD, or the reduced form, NADH.