<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def get_instance(self, payload):
 """ Build an instance of SubscribedTrackInstance :param dict payload: Payload response from the API :returns: twilio.rest.video.v1.room.room_participant.room_participant_subscribed_track.SubscribedTrackInstance :rtype: twilio.rest.video.v1.room.room_participant.room_participant_subscribed_track.SubscribedTrackInstance """

        return SubscribedTrackInstance(
            self._version,
            payload,
            room_sid=self._solution['room_sid'],
            subscriber_sid=self._solution['subscriber_sid'],
        )