Selenite F broth is an enrichment media for?

Ananthanarayan and Panicker's Textbook ofMicrobiology 8thEdition pg no:40 Enrichment media: in mixed culture or in material containing more than one bacterium, the bacterium to be isolated is often overgrown by the unwanted bacteria usually the nonpathogenic or commensal bacteria tend to grow the pathogenic one for eg: S.typhi being overgrown by E.coli in cultures from feces. In such situations, a substance that has a stimulating effect on the bacteria to be grown or an inhibitory effect on those to be suppressed are incorporated in the medium. If such substances are added to a liquid medium the result is an absolute increase in the number of the wanted bacterium relative to other bacteria. such media are called enrichment media. for eg: tetrathionate broth where the tetrathionate inhibit coliforms while allowing typhoid -paratyphoid bacilli to grow freely, and selenite F broth for dysentery bacilli