Question: when did marriage equality became legal in australia
[{'answer': '7 December 2017', 'provenance': [{'wikipedia_id': '51585228', 'title': 'History of same-sex marriage in Australia', 'start_paragraph_id': 1, 'start_character': 556, 'end_paragraph_id': 1, 'end_character': 571, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '51585228', 'title': 'History of same-sex marriage in Australia', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 615, 'bleu_score': 0.9806740509884301, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 9156159620742942015}, 'section': 'Section::::Abstract.'}]}]