<div ng-repeat="paper in questionPaper" class="margin_buttom_10px" 
ng-init="response.take[paper.f]=1">
                 <div class="row"><label class="label 
answer_label">Q{{$index+1}}.</label>{{paper.question}}</div>
                   <div class="row answwer_row answwer_row">
                          <div class="row ">
                         <div class="col-lg-10 "> 
                    <div class="col-lg-6"><label class=" label 
label-success col-lg-1" for="Q{{$index}}1" 
ng-click="addClass()">A</label>{{paper.a}}<input type="radio" 
name="Q{{$index}}" value="{{paper.a}}" ng-model="response.take[paper.f]" 
id="Q{{$index}}1" class="hidden1" ></div>
                       <div class="col-lg-6"><label class="label 
label-success col-lg-1" ng-click="addClass()" 
for="Q{{$index}}2">B</label>{{paper.b}}<input type="radio" 
name="Q{{$index}}" value="{{paper.b}}" ng-model="response.take[paper.f]" 
id="Q{{$index}}2" class="hidden1" ></div>
                      </div> 
                  </div>    
                      <div class="row">
                        <div class="col-lg-10"> 
                       <div class="col-lg-6"><label class="label 
label-success col-lg-1" for="Q{{$index}}3" 
ng-click="addClass()">C</label>{{paper.c}}<input type="radio" 
name="Q{{$index}}" value="{{paper.c}}" ng-model="response.take[paper.f]" 
id="Q{{$index}}3" class="hidden1" ></div>
                       <div class="col-lg-6"><label class="label 
label-success col-lg-1" for="Q{{$index}}4" 
ng-click="addClass()">D</label>{{paper.d}}<input type="radio" 
name="Q{{$index}}" value="{{paper.d}}" ng-model="response.take[paper.f]" 
id="Q{{$index}}4" class="hidden1" ></div>
                      </div> 
                  </div> 

           </div>   

        </div>

For each question there are 4 option. So when a option is clicked a class 
is added . When a option is clicked on the same question , previous class 
removed and class added to current option. But for that i need to access 
each child scope of ng-repeat. That is each scope for each question. How to 
do it?

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