def qrel_entry(quest_id, answ_id, rel_grade):
    """Produces one QREL entry

    :param quest_id:  question ID
    :param answ_id:   answer ID
    :param rel_grade: relevance grade
    :return: QREL entry
    """
    return f'{quest_id}\t0\t{answ_id}\t{rel_grade}'