Just do one thing, We need to set the name property for the same types. for eg.
Try below:
<form>
<div id="group1">
<input type="radio" value="val1" name="group1">
<input type="radio" value="val2" name="group1">
</div>
</form>
And also we can do it in angular1,angular 2 or in jquery also.
<div *ngFor="let option of question.options; index as j">
<input type="radio" name="option{{j}}" value="option{{j}}" (click)="checkAnswer(j+1)">{{option}}
</div>