title: select option not working with ng-model in angular 4
body: <p>I have a select box where I show elements from a list 
  Code Snippet:</p>
  
  <pre><code>export class CreateauctionComponent implements OnInit{
  
      createAuctionForm: FormGroup;
      test:any = ["cat","dog"];
  
      constructor(private _formBuilder: FormBuilder,private _categories: UserCategoriesForAuctionService){
          //
      }
  }
  </code></pre>
  
  <p>In HTML rendered as:</p>
  
  <p></p>
  
  <pre><code>&lt;div class="form-col"&gt;
      &lt;h5&gt;&lt;span style="color:red;"&gt;*&lt;/span&gt;{{'createAuction.category' | translate}}:&lt;/h5&gt;
      &lt;select class="form_cbx long-select" name="" ng-model="test"&gt;
          &lt;option  ng-options="t in test"&gt;{{t}}&lt;/option&gt;
      &lt;/select&gt;   
  &lt;/div&gt;
  </code></pre>
  
  <p>I am not able to see any values. Only one blank field in the list. Can anyone direct what is the issue here?</p>