question: On which anniversary of his Humanae Vitae did Paul VI reconfirm the beliefs set forth by the Humanae Vitae ?
answer: tenth
turker_answer: On the tenth anniversary of his Humanae Vitae , Paul VI reconfirmed the beliefs set forth by the Humanae Vitae .
rule-based: Paul VI reconfirmed the beliefs set forth by the Humanae Vitae on tenth .