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

Which of the following definitions best describes 'obsolete neurotoxin activity'?

A. OBSOLETE. Acts to inhibit neural function in another living organism.
B. OBSOLETE. Any process that decreases the rate, extent or frequency of the chemical reactions and pathways involving carbohydrates, any of a group of organic compounds based of the general formula Cx(H2O)y, as carried out by individual cells.
C. OBSOLETE. Catalysis of the reaction: a deoxynucleoside diphosphate + H2O = a deoxynucleotide + phosphate.
D. OBSOLETE. Any process that activates or increases the frequency, rate or extent of myosin light chain kinase activity.

Answer: OBSOLETE. Acts to inhibit neural function in another living organism.