Laravel - unable to return data from an Javascript request to populate a dropdown

I'm attempting to create a dynamic dropdown but unfortunately, no data is being populated on the second dropdown. I have followed this tutorial.

My setup so far:

Initial dropdown:

{!! Form::select('Specialisms', $specialisms, null, 
    ['class' => 'form-control selectpicker', 'name' => 'specialisms', 
    'data-notblank' => 'true', 'required' => 'required']) !!}

Second dropdown:

<select id="treatments" class="form-control selectpicker" name="treatments[]" 
     data-live-search="true" required="required" multiple="multiple">
     <option value=""></option>
</select>

Route to return the 'treatments' data':

Route::get('/treatments', function () {
    $specialism_id = Input::get('specialisms');
    $treatments = Treatment::where('specialism_id', $specialism_id)
                            ->pluck('treatment', 'id');
    return $treatments;
})->name('getTreatments');

Observation - On the code above, I'm unsure how `Input::get('specialisms') will return the ID from the first dropdown?

Javascript to tie it all together:

$(document).ready(function ($) {
    $('#specialism').change(function () {
        $.get("",
             {option: $(this).val()},
                 function (data) {
                     var model = $('#treatments');
                        model.empty();

                     $.each(data, function (index, element) {        
                     model.append("<option value='" + 
                     element.id + "'>" + element.name + "</option>");
                    });
              });
        });
    });

Nothing at all is being populated in the second dropdown and I'm unsure why. Debugging Ajax is most certainly not my strong point either. Many thanks in advance.

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