How to change only specific color of radio button in angular?

I have crated angular application for examination in which user gives exam and finally show full report with selected answer I have used ng-repeat for radio button to show options and I want to show user has selected answer and corrected answer if user has selected wrong than its should be red else green but it I have checked using conditions but it changing all radio button colors here is code

<div class="md-radio"
             data-ng-repeat="data in vm.examQuestions.allOptions track by $index"
             ng-class="{correct:vm.examQuestions.attemptQuestions.yourChoice === vm.examQuestions.correctanswer ||
             vm.examQuestions.correctanswer === vm.optionsArr[$index],
        'has-error':vm.examQuestions.attemptQuestions.yourChoice !== vm.examQuestions.correctanswer}">
            <span class="lblOption"></span>
            <input type="radio" id="" name="radio" class="md-radiobtn"
                   ng-model="vm.examQuestions.attemptQuestions.yourChoice"
                   ng-value="vm.optionsArr[$index]"
                   ng-disabled="true">
            <label for="">
                <span class="inc"></span>
                <span class="check"></span>
                <span class="box"></span>
                <label ng-if="'string' === vm.checkOptionString(data);"></label>
                <img ng-src="" ng-if="'URL' === vm.checkOptionString(data);" width="40px">
            </label>

can someone tell me how to apply color only to specific radio button if user has selected right or wrong options
thanks in advance

Source: AngularJS

from Angular Questions https://angularquestions.com/2017/09/30/how-to-change-only-specific-color-of-radio-button-in-angular/
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