Anexar a opção para selecionar o Ajax JavaScript

$.ajax({
  url : "file_url",
  type:'POST',
  dataType: 'json',
  success: function(response) {
    $.each(response,function(key, value){
      $("#select_id").append('<option value=' + key + '>' + value + '</option>');
    });
  }
});
Rich Raven