RemoteControl 2 API, Export only a specified question group by token. - by: Maverick87Shaka

Hi,
in order to improve my application , I would like to retrieve the "response" array only of a specified question ID.
Actually I'm using the export_responses_by_token() function, that return all the responses.
looking at the documentation there is a $aFields ( array ) named as "Optional Selected fields", it's this what I need?
How I have to build this array?
The group that I need actually is "personal data" (GroupID 121), containing question code ANAG1,ANAG2 and so on.

My actual code is:
And return all the response without any filter.

Thanks