Dynamic Radio Button PHP

I am currently creating an online quiz. In order for me to retrieve information from the input, I think I am required to input a value for the radio button. I wish to input the values as 1 for the first, 2 for the second etc. Since i have used this echo in php, I am assuming it has to be some sort of variable?

I have tried different loop but I can't seem to get it working. Sorry if this sounds like an easy question. Any help would be appreciated!

    <!DOCTYPE html>

<html>
<head>
    <meta charset="UTF-8">
    <title></title>
    <title>Online Quiz</title>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">

    <link rel="stylesheet" href="css/bootstrap.css">
    <link rel="stylesheet" href="css/styles.css">  
</head>


<body>
    <div>
        <form action="" method="post" id="quiz">
            <?php
            require'./quizData.php';
            include('Header.php');

            foreach ($quizSGHistoryQ as $questionNo => $questionInfo) {

                echo "<br>" . $questionNo . ")";

                echo $questionInfo['question'];

                echo $questionInfo['answer'] . "<br>";

                foreach ($questionInfo['options'] as $option => $desc) {






                        echo "<input type= 'radio' name = " . $questionNo  .      " >" . $desc . "<br>";


                }
            }







            include('Footer.php');
            ?>

            <input type="submit" name="submit" value="Submit">


        </form>
    </div>

    <?php
    foreach ($quizSGHistoryQ as $questionNo => $questionInfo) {

        $pickedAns = $_POST [$questionNo];


        $totalScore = 0;

        if ($pickedAns == $questionInfo['answer']) {

            $totalScore++;
        }
    }
    ?> 



</body>

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