AngularJS - Selects and ng-options

HTML

<script src="http://code.angularjs.org/1.1.4/angular.js"></script>
<link rel="stylesheet" href="//netdna.bootstrapcdn.com/twitter-bootstrap/2.3.1/css/bootstrap-combined.min.css">
<div ng-app="myapp">
    <fieldset ng-controller="FirstCtrl">
        <select 
            ng-options="item.code as item.name for item in regions"
            ng-model="region"></select>
    </fieldset>
</div>

JavaScript

var myapp = angular.module('myapp', []);
myapp.controller('FirstCtrl', function ($scope) {
    $scope.regions = 
 [
      {
        name: "COLOMBIA",
        code: 5
      },
      {
        name: "ARGENTINA",
        code: 6
      },
      {
        name: "BRAZIL",
        code: 7
      }
  ];
  
  $scope.selectThisId={
    "id":6,
    "animal":'dog',
    "variable":'xxx32'
 };
 
 $scope.region=$scope.selectThisId.id;
});