Question: who was the first avatar ever in the last airbender
[{'answer': 'Avatar Roku', 'provenance': [{'wikipedia_id': '1620586', 'title': 'Avatar: The Last Airbender', 'start_paragraph_id': 9, 'start_character': 333, 'end_paragraph_id': 9, 'end_character': 344, 'bleu_score': 1.0, 'section': 'Section::::Series overview.:Synopsis.\n'}]}, {'provenance': [{'wikipedia_id': '1620586', 'title': 'Avatar: The Last Airbender', 'start_paragraph_id': 9, 'start_character': 164, 'end_paragraph_id': 9, 'end_character': 1201, 'bleu_score': 0.9157858615070211, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 10515936924757503784}, 'section': 'Section::::Series overview.:Synopsis.\n'}]}]