delete label from dropdown box

I want to eliminate the label part of the below dropdown box but, I am pasting my code so any one can help me on how exactly the code should look like.

function loadoperaciones() {
wixData.query(‘operaciones’)
.find()
.then(res => {
let options = [{“value”: ‘’, “label”: ‘Seleccionar una opcion’}];
options.push(…res.items.map(operacion => {
return {“value”: operacion.title, “label”: operacion.title};
}));
$w(‘#ioperacion’).options = options;

  }); 

  }