pre selecting radio button on quiz page.

hi,
i wonder how to preselect a radio button on quiz page?
i am using quiz-1.html template for quiz page on my project. i want to render the radio buttons in a way that if an answer was already selected, it should be preselected at the time of rendering. and i figure that to render this, i must add class "active" in the

element. but this does not seem to work. here is my code snippet.

@foreach (var answer in Model.currentQuestion.Answers)
{
string cls = "";
if (answer.isSubmitted)
{
cls = "active";
}

@answer.Description

}

please guide me how to make a radio button pre-selected?

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