how to store answer into a database - laravel

Question

I have created a multiple choice question and able to store them into a database, I need when a user select the correct answer it stores the id of the question and the answer. Please anyone who can help me how to do it
Here is my form for creating the questions
#foreach($qns as $qn)
{{$qn->question_name}}
<div class="form-check">
<label class="form-check-label" for="opt1">
<input type="radio" class="form-check-input" id="opt1"
name="opt{{ $qn->id }}" value="a">{{$qn->opt1}}
</label>
</div>
<div class="form-check">
<label class="form-check-label" for="opt2">
<input type="radio" class="form-check-input" id="opt2"
name="opt{{ $qn->id }}" value="b">{{$qn->opt2}}
</label>
</div>
<div class="form-check">
<label class="form-check-label" for="opt3">
<input type="radio" class="form-check-input" id="opt3"
name="opt{{ $qn->id }}" value="c">{{$qn->opt3}}
</label>
</div>
<div class="form-check">
<label class="form-check-label" for="opt4">
<input type="radio" class="form-check-input" id="opt4"
name="opt{{ $qn->id }}" value="d">{{$qn->opt4}}
</label>
</div>
#endforeach
Here is my controller
public function store(Request $request){
// dd($request->all());
$this->validate($request,[
'question_id' =>'required|string',
'opt'.$qn->id =>'required|string',
]);
$qn= Answer::create([
'question_id'=>$request['question_id'],
'opt'=>$request['opt'.$qn->id],
]);
}

Answer 1

Do it like
public function saveAnswers(Request $request)
{
$questions = Questions::all();
foreach($questions as $qns){
$name = "opt".$qns->id;
Answer::create([
'question_id'=>$qns->id,
'answer'=>$request->$name,
]);
}
}