if you can have your pick or take your pick of different things, you can choose which one you want:
Have a look at the menu and take your pick.
He knew he could take his pick of any of the girls in the office.
Sarah could have her pick of any university in the country.
have/get first pick (of something)
She always gets first pick of the videos.
the best things in a group:
In tonight's programme we'll be discussing the pick of this month's new movies.
There were fifteen candidates for the job, and he was the pick of the bunch (=the best one).
3 [countable] informal
your pick is the person or thing that you have chosen from a group [= choice]:
There are a lot of good horses in the race, but Archimedes would be my pick.
5 [countable] informalAPM
a small, flat object that you use for pulling at the strings of a musical instrument such as a guitar [= plectrum]