var app = angular.module('plunker', []);

app.controller('MainCtrl', function($scope) {
  $scope.categories = ['Thriller', 'Drama', 'Horror', 'SF'];
  $scope.book = {};
});
<!DOCTYPE html>
<html ng-app="plunker">

  <head>
    <meta charset="utf-8" />
    <title>AngularJS Plunker</title>
    <script>document.write('<base href="' + document.location + '" />');</script>
    <link rel="stylesheet" href="style.css" />
    <script data-require="angular.js@1.2.x" src="https://code.angularjs.org/1.2.22/angular.js" data-semver="1.2.22"></script>
    <script src="app.js"></script>
  </head>

  <body ng-controller="MainCtrl">
    <select ng-options="category for category in categories" ng-model="book.category"></select>

    <p>Book's category: {{ book.category }}</p>
  </body>

</html>
/* Put your css in here */