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

Which of the following definitions best describes 'obsolete 1,4-dihydroisonicotinate 2,3-dioxygenase activity'?

A. OBSOLETE. Any process that modulates the frequency, rate or extent of adhesion of symbiont to host epithelial cell.
B. OBSOLETE. Catalysis of the reaction: 1,4-dihydroisonicotinate + O2 = gamma-N-formylaminovinylacetaldehyde + CO2.
C. OBSOLETE. Any process that modulates the rate, frequency, or extent of cell aging. Cell aging is the progression of the cell from its inception to the end of its lifespan.
D. OBSOLETE. The assembly of a flagellum. In bacteria, this is a whiplike motility appendage present on the surface of some species; in eukaryotes, flagella are threadlike protoplasmic extensions used to propel flagellates and sperm. Flagella are composed of flagellin and have the same basic structure as cilia but are longer in proportion to the cell and present in much smaller numbers.

Answer: OBSOLETE. Catalysis of the reaction: 1,4-dihydroisonicotinate + O2 = gamma-N-formylaminovinylacetaldehyde + CO2.