AngularJS ng-class if-else expression

With AngularJS I’m using ng-class the following way:

<div class="bigIcon" data-ng-click="PickUp()" 
ng-class="{first:'classA', second:'classB', third:'classC', fourth:'classC'}[call.State]"/>

I’m wondering if I can use the if-else expression to do something similar to this:

<div class="bigIcon" data-ng-click="PickUp()" 
ng-class="{first:'classA', second:'classB', else:'classC'}[call.State]"/>

So whenever call.State differs from first or second use classC and avoid specifying each value?