I only update when I feel like it.

bootstrapの Collapse をradio（あるいはCheckbox）で。
具体的には、送信フォームでradio（あるいはCheckbox）で選択してCollapseを使う、というものです。

checkbox

<form>
  <div class="form-group">
    <div class="form-check">
      <input class="form-check-input" type="checkbox" value="" id="defaultCheck1">
      <label class="form-check-label" for="defaultCheck1">
      Default checkbox1
      </label>
    </div>
    <div class="form-check">
      <input class="form-check-input" type="checkbox" data-toggle="collapse" data-target="#collapseExample" aria-expanded="false" aria-controls="collapseExample" value="" id="defaultCheck2">
      <label class="form-check-label" for="defaultCheck2">
      Disabled checkbox2
      </label>
    </div>
    <div class="collapse mt-2" id="collapseExample">
      <div class="card card-body">
      Anim pariatur cliche reprehenderit, enim eiusmod high life accusamus terry richardson ad squid. Nihil anim keffiyeh helvetica, craft beer labore wes anderson cred nesciunt sapiente ea proident.
      </div>
    </div>
  </div>
</form>

radio

<form>
  <div class="form-group">
    <div class="form-check">
      <input class="form-check-input" type="radio" data-toggle="collapse" data-target="#collapseTwo.show" name="exampleRadios" id="exampleRadios1" value="option1">
      <label class="form-check-label" for="exampleRadios1">
        Default radio1
      </label>
    </div>
    <div class="form-check">
      <input class="form-check-input" type="radio" data-toggle="collapse" data-target="#collapseTwo.show" name="exampleRadios" id="exampleRadios2" value="option2">
      <label class="form-check-label" for="exampleRadios2">
        Second default radio2
      </label>
    </div>
    <div class="form-check">
      <input class="form-check-input" type="radio" data-toggle="collapse" data-target="#collapseTwo:not(.show)" aria-expanded="true" aria-controls="collapseTwo" name="exampleRadios" id="exampleRadios3" value="option3">
      <label class="form-check-label" for="exampleRadios3">
        third default radio3
      </label>
    </div>
    <div class="collapse mt-2 collapseTwo" id="collapseTwo">
      <div class="card card-body">
      Anim pariatur cliche reprehenderit, enim eiusmod high life accusamus terry richardson ad squid. 3 wolf moon officia aute, non cupidatat skateboard dolor brunch. Food truck quinoa nesciunt laborum eiusmod. Brunch 3 wolf moon tempor, sunt aliqua put a bird on it squid single-origin coffee nulla assumenda shoreditch et. Nihil anim keffiyeh helvetica, craft beer labore wes anderson cred nesciunt sapiente ea proident. Ad vegan excepteur butcher vice lomo. Leggings occaecat craft beer farm-to-table, raw denim aesthetic synth nesciunt you probably haven't heard of them accusamus labore sustainable VHS.
      </div>
    </div>
  </div>
</form>

data-target=”#collapseTwo.show”
data-target=”#collapseTwo:not(.show)”
# ～ の部分はIDでもclassでもOKです。
classを使う場合は、
data-target=”.collapseTwo.show”
data-target=”.collapseTwo:not(.show)”

DEMO

Checkboxes and radios + Collapse DEMO