cakephp-3 - lists records in drop down

My code for array is

        $degrees = TableRegistry::get('Degrees');
        $degreelist = $degrees->find('list', ['fields' => ['id', 'concat(name,degree) as name']]);

not created dropdown but if I create query

        $degrees = TableRegistry::get('Degrees');
        $degreelist = $degrees->find('list', ['fields' => ['id', 'name']]);
dropdown created but I need first one.

in mysql query will be :-
       SELECT id,concat(name,degree) FROM `degrees`

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