Populate five dropdowns (not dependent) in single Ajax call in Codeigniter - json

Question

Framework - Codeigniter
I need to populate multiple drop down lists on view onload function. Currently I use five Ajax requests to populate five dropdowns. I think this is inefficient and will reduce my application performance and increase the bandwidth usage. Is there any efficient alternative way to do this? (like populate them all in single Ajax call)
In my View
$(document).ready(function() {
{
$.ajax({
url:"<?php echo base_url(); ?>index.php/Pharmacy_elements/fetch_main_catagories",
method:'get',
headers: XMLHttpRequest + new Date().getTime(),
success:function(data){
$('#main_catagory').html(data);
}
})
}
{
$.ajax({
url:"<?php echo base_url(); ?>index.php/Pharmacy_elements/fetch_sub_catagories",
method:'get',
headers: XMLHttpRequest + new Date().getTime(),
success:function(data){
$('#sub_catagory').html(data);
}
})
}
{
$.ajax({
url:"<?php echo base_url(); ?>index.php/Pharmacy_elements/fetch_serving_types",
method:'get',
headers: XMLHttpRequest + new Date().getTime(),
success:function(data){
$('#common_serving_type').html(data);
}
})
}
{
$.ajax({
url:"<?php echo base_url(); ?>index.php/Pharmacy_elements/fetch_approved_suppliers",
method:'get',
headers: XMLHttpRequest + new Date().getTime(),
success:function(data){
$('#supplier_name').html(data);
}
})
}
})
My Controller
public function fetch_mother_companies()
{
$output = '';
$this->load->model('Pharmacy_model');
$data = $this->Pharmacy_model->fetch_mother_companies();
// $output .='<option value=0>All</option>';
if($data->num_rows()>0){
foreach($data->result() as $row){
$output .='
<option value='.$row->id.'>'.$row->company_name.'</option>';
}
}
else {
}
echo $output;
}
public function fetch_main_catagories()
{
$output = '';
$this->load->model('Pharmacy_model');
$data = $this->Pharmacy_model->fetch_main_catagories();
// $output .='<option value=0>All</option>';
if($data->num_rows()>0){
foreach($data->result() as $row){
$output .='
<option value='.$row->id.'>'.$row->category_name.'</option>';
}
}
else {
}
echo $output;
}
public function fetch_sub_catagories()
{
$output = '';
$this->load->model('Pharmacy_model');
$data = $this->Pharmacy_model->fetch_sub_catagories();
// $output .='<option value=0>All</option>';
if($data->num_rows()>0){
foreach($data->result() as $row){
$output .='
<option value='.$row->category_id.'>'.$row->category_name.'</option>';
}
}
else {
}
echo $output;
}