Selective

adjective

1. Of or relating to the process of selection.
2. Of or relating to natural selection.

   "selective pressure"

3. (of a person) choosy, fussy or discriminating when selecting.

   "He's very selective and spent hours in the store choosing a new shirt."

4. Having the authority or capability to make a selection.

   "In the USA, military conscription is controlled by the Selective Service."