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

Which of the following definitions best describes 'toloxatone'?

A. A racemate consisting of equimolar amounts of (R)- and (S)-the concept. It is a reversible monoamine oxidase A inhibitor and antidepressant.
B. A racemate comprising equimolar amounts of (1R,5S) and (1S,5R)-the concept. It is a pro-herbicide (by hydroyltic loss of the phenylthio group to afford the corresponding meso-triketone) used for the control of both annual and perennial weeds in rice.
C. A racemate comprising equimolar amounts of (R)- and (S)-clostanel. An anthelmintic, it is used (as the dihydrate of the sodium salt) in veterinary medicine for the treatment of fluke and nematode infections.
D. A racemate comprising equimolar amounts of Se-methyl-D-selenomethionine and Se-methyl-L-selenomethionine.

Answer: A racemate consisting of equimolar amounts of (R)- and (S)-the concept. It is a reversible monoamine oxidase A inhibitor and antidepressant.