There are several ways to accomplish this.
One method would be to duplicate the base layer and convert the duplicate to b/w, then either mask or delete (allowing the background layer to show through) the part you want to be in color.
Another option would be to make a selection of the area you want to remain in color, invert the selection, then use a hue/sat/brightness tool/layer to desaturate the selection.
Neither of these is allowable in a challenge under the basic rules.
Also, although not as flexible, here is a tutorial on a method that *is* allowable under the basic rule set: //www.dpchallenge.com/tutorial.php?TUTORIAL_ID=25
I am sure you can find some good tutorials with examples for whatever editing application you use through google.
Hope that helps.
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