<li><label><input name="answer_{{ $loop->iteration }}" type="radio" value="a">Постоянно</label></li>
<li><label><input name="answer_{{ $loop->iteration }}" type="radio" value="b">Иногда</label></li>
<li><label><input name="answer_{{ $loop->iteration }}" type="radio" value="c">Время от времени</label></li>