Array
(
    [0] => Array
        (
            [id_rol] => 1
            [nombre] => Administrador
        )

    [1] => Array
        (
            [id_rol] => 2
            [nombre] => Medico
        )

    [2] => Array
        (
            [id_rol] => 3
            [nombre] => Paciente
        )

    [3] => Array
        (
            [id_rol] => 4
            [nombre] => Recepcionista
        )

)