How to remove cancel option from ionic-select-option

Ionic Framework
1 
<ion-select  interface="action-sheet" formControlName="showArrow" placeholder="Select One" (ionChange)="submitUserInput($event.target,'showArrow')">

        <ion-select-option value="true" selected="true">On</ion-select-option>

        <ion-select-option value="false">Off</ion-select-option>

 </ion-select>

Is there any attribute then I put on ion-select to remove the cancel option from it?