JSFiddle - React, Tailwind, and code Playground

HTML

<script type="text/javascript" ng:autobind src="https://ajax.googleapis.com/ajax/libs/angularjs/1.4.3/angular.min.js"></script>
<div ng-app="myApp" ng-controller="myCtrl">
    
    <select ng-model="selected" ng-options="key as value for (key, value) in data.types">
    </select>
    
</div>
<script>
    var app = angular.module('myApp', []);
app.controller('myCtrl', function($scope) {
    $scope.data = {
        "types" : {
            "4" : "x",
            "5": "c",
            "9": "y"
        }
    };
   
}); 
</script>