In the context of the input sentence, determine the relationship between 'department store chain' and 'retail'.
Options: stock exchange, founded by, creator, industry

And the same thing with Mervyns way back when, where there was a department store chain that needed a turnaround at the opco level, but equally important was a turnaround at the propco level, and that's where we were involved, taking closed stores and converting them into other retail uses or other mixed uses.
industry