Getting extra fields from laravel api having belongstomany relationship

I have two data tables related each other by belongstomany relationship. And when I am fetching data from its api controllers with selecting only two column keys ['id','title'] yet it returns some extra data in response object.

model code:

public function place(){

    return $this->belongsToMany(Place::class,'city_place')->select(array('id', 'title'));

}

controller code:

public function ofcity($id) {

    $city=City::findOrFail($id);


    return new CityResource(  $city->place()->get());


}

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