Question: when did the royal flying doctor service start
[{'answer': 'May 1928', 'provenance': [{'wikipedia_id': '1033979', 'title': 'Royal Flying Doctor Service of Australia', 'start_paragraph_id': 11, 'start_character': 460, 'end_paragraph_id': 11, 'end_character': 468, 'bleu_score': 1.0, 'section': 'Section::::History.:Flight and radio: the fusion of two fledgling technologies.\n'}]}, {'provenance': [{'wikipedia_id': '1033979', 'title': 'Royal Flying Doctor Service of Australia', 'start_paragraph_id': 11, 'start_character': 0, 'end_paragraph_id': 11, 'end_character': 787, 'bleu_score': 0.9577362712813341, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 14083073455356596311}, 'section': 'Section::::History.:Flight and radio: the fusion of two fledgling technologies.\n'}]}]