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

Which of the following definitions best describes 'obsolete pentachlorophenol biosynthetic process'?

A. OBSOLETE. Any constituent part of a cell septum, a structure composed of peptidoglycan and often chitin in addition to other materials. It usually forms perpendicular to the long axis of a cell or hypha and grows centripetally from the cell wall to the center of the cell and often functions in the compartmentalization of a cell into two daughter cells.
B. OBSOLETE. The process in which a signal is passed on to downstream components located at the endosome. Endosomes can provide important intracellular signaling platforms and provide spatial and temporal control over signal transduction.
C. OBSOLETE. The chemical reactions and pathways resulting in the formation of alcohols, any of a class of compounds containing one or more hydroxyl groups attached to a saturated carbon atom, carried out at the level of an individual cell.
D. OBSOLETE. The chemical reactions and pathways resulting in the formation of pentachlorophenol, a chlorinated insecticide and fungicide used primarily to protect timber from fungal rot and wood boring insects. Pentachlorophenol is significantly toxic to mammals, plants, and many microorganisms.

Answer: OBSOLETE. The chemical reactions and pathways resulting in the formation of pentachlorophenol, a chlorinated insecticide and fungicide used primarily to protect timber from fungal rot and wood boring insects. Pentachlorophenol is significantly toxic to mammals, plants, and many microorganisms.