Get the first element of an array with AngularJS

I'm starting in angularjs and I've already created my first API with djangorestframework .

I have this factory and a controller to consume the data:

(function(){
  "use strict";

  angular.module('core.controllers', [])
    .controller('CMIUtils', CMIUtils)
    .factory("PolicyFactory", PolicyFactory);

  CMIUtils.$inject = ['$scope', 'PolicyFactory'];
  PolicyFactory.$inject = ['$resource'];

  function CMIUtils($scope, PolicyFactory) {
    $scope.date = new Date();
    $scope.politicas = PolicyFactory.get();
  }

  function PolicyFactory($resource) {
    return $resource(
      "/api/v1.0/politica/",
      {},
      { 'get': {method: "GET", isArray: false}}
    );
  }
})();

On my page, I use <li ng-controller="CMIUtils">{$ politicas.results $}</li> and what I get, of course this is:

<li ng-controller="CMIUtils" class="ng-scope ng-binding">
  [
    {"revision":4,"fecha":"2016-04-16","politica":"Esta es la cuarta política"},
    {"revision":3,"fecha":"2016-04-04","politica":"Esta es la tercera política"},
    {"revision":2,"fecha":"2016-04-02","politica":"Esta es la segunda política"},
    {"revision":1,"fecha":"2016-04-01","politica":"Esta es la primera política"}
  ]
</li>

The list, as such, will be used at another time with ng-repeat , but at this time, I would like to know how to get the first element of this list .

  

I'm not saying how to get the detail , only the first element of any list generated with the .factory() method.