Question: who was involved in the yirrkala bark petition
[{'answer': 'Yolngu people', 'provenance': [{'wikipedia_id': '5280802', 'title': 'Yirrkala bark petitions', 'start_paragraph_id': 5, 'start_character': 4, 'end_paragraph_id': 5, 'end_character': 17, 'bleu_score': 1.0, 'section': 'Section::::History.\n'}]}, {'provenance': [{'wikipedia_id': '5280802', 'title': 'Yirrkala bark petitions', 'start_paragraph_id': 5, 'start_character': 0, 'end_paragraph_id': 5, 'end_character': 294, 'bleu_score': 0.957870874785216, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 13247091910313646514}, 'section': 'Section::::History.\n'}]}]