Answers for "bootstrap classes for select options"

bootstrap select

<div class="form-group">
    <label for="exampleSelect">Example select</label>
    <select class="form-control" id="exampleSelect">
      <option>1</option>
      <option>2</option>
      <option>3</option>
      <option>4</option>
      <option>5</option>
    </select>
</div>

bootstrap file select class

<form>
  <div class="form-group">
    <label for="exampleFormControlFile1">Example file input</label>
    <input type="file" class="form-control-file" id="exampleFormControlFile1">
  </div>
</form>