Select open item (div)

js

<section>

  <select id="selectOptions">
      <option data-name="man">
          man1
      </option>
      <option data-name="woman">
          woman
      </option>
      <option data-name="child" selected>
          child
      </option>   
  </select>

  <div class="dataTest" data-name="man">Hey Man</div>

  <div class="dataTest" data-name="woman">Hello Woman</div>

  <div class="dataTest" data-name="child">Hi Child</div>

</section>


var nameValue = $('#selectOptions option:selected').data('name');
 
$('.dataTest').hide().filter(function(){
    	return $(this).data('name') === nameValue
}).show();
 
$('#selectOptions').on('change', function() {
 
    var nameValue = $('#selectOptions option:selected').data('name');

		$('.dataTest').hide().filter(function(){
    	return $(this).closest("section").data('name') === nameValue
		}).show();
    
});