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

Which of the following definitions best describes 'obsolete trimethylarsine oxidase activity'?

A. OBSOLETE. Catalysis of the reaction: trimethylarsine oxide + 2 H+ + 2 e- = trimethylarsine + H2O.
B. OBSOLETE. Binds to transforming growth factor beta receptor and anchors it to a particular subcellular location.
C. 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.
D. OBSOLETE. The process of introducing one or more phosphate groups into a nucleotide to produce a phosphorylated nucleoside.

Answer: OBSOLETE. Catalysis of the reaction: trimethylarsine oxide + 2 H+ + 2 e- = trimethylarsine + H2O.