question: What helps Gustave prove his innocence ?
answer: Gustave 's innocence is finally proven by the discovery of the copy of Madame D 's second will
turker_answer: Gustave 's innocence is finally proven by the discovery of the copy of Madame D 's second will .
rule-based: Gustave 's innocence is finally proven by the discovery of the copy of Madame D 's second will helps Gustave prove his innocence .