how to get rid from id column when i use find('list')

hii i m new in cakephp

in my code
$var=
     $this->Login->find('list',

     array(
     'fields'=>'Category',
         'order'=>'Login.Category  ASC',
             'conditions'=>array('Login.username'=>$dbuser['Login']['username'])
     ));

when i execute this code the framework is adding Login.id to the query. i  want  only one field Login.Category.how to get rid from login id...plz help

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