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

Which of the following definitions best describes 'alternariol hapten ALa'?

A. A monocarboxylic acid that is propionic acid in which one of the hydrogens at position 2 is substituted by a 4-[(2-oxocyclopentyl)methyl]phenyl group. A prodrug that is rapidly converted into its active trans-alcohol metabolite following oral administration.
B. An alternariol hapten that is one of two regioisomeric haptens of the mycotoxin alternariol in which the five-atom carboxylated aliphatic spacer arm is located through the hydroxy group at C-9.
C. A member of the class of imidazolidinones that is dethiobiotin carrying a mercapto substituent at position 9. An intermediate in the biosynthesis of biotin.
D. A member of the class of indoles that is 1H-indole substituted by a isopropyl group at position 5, a tert-butylsulfanediyl group at position 3, a 4-chlorobenzyl group at position 1 and a 2-carboxy-2-methylpropyl group at position 2. It acts as an inhibitor of arachidonate 5-lipoxygenase.

Answer: An alternariol hapten that is one of two regioisomeric haptens of the mycotoxin alternariol in which the five-atom carboxylated aliphatic spacer arm is located through the hydroxy group at C-9.