Question: who won the afl grand final last year
[{'answer': 'Richmond', 'provenance': [{'wikipedia_id': '51846546', 'title': '2017 AFL Grand Final', 'start_paragraph_id': 1, 'start_character': 116, 'end_paragraph_id': 1, 'end_character': 124, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '51846546', 'title': '2017 AFL Grand Final', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 603, 'bleu_score': 0.714814568169826, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 974833797782172180}, 'section': 'Section::::Abstract.'}]}]