Bind drop down option in Angular 5

Question

Belo option bind on ngOnInit()  after call the service data and bind the option it is working fine.

 

this.Service.Loadspecial().subscribe(result=>{

this.specialdata=result;

});

 

 

<select (change)="selectOption2($event.target.value)" class="form-control" style="height:3rem;">

<option value="0">--Select --</option>

<option [value]="special.specialID" *ngFor="let special of specialdata" >

{{special.specialname}}

</option>

</select>

 

I need some condition directly bind {{special.specialname}} in option how to implement.

Not need for selecting the option in existing record.