<form #f="ngForm" (ngSubmit)="nextQuestion(f)" novalidate>
  <div class="alert alert-grey question">
    {{question.question}} ({{question.points}}pkt.)
    <div class="answers">
      <div *ngFor="let item of question.answers">
        <input type="radio" name="answer" [value]="item.content" ngModel> {{item.content}}
      </div>
    </div>
  </div>

  <button class="btn btn-study-cave" type="submit"><i class="fas fa-arrow-right"></i> Dalej</button>
</form>