Question: what was the first fast food restaurant to open
[{'answer': 'A&W in 1919'}, {'provenance': [{'wikipedia_id': '54923', 'title': 'Fast food restaurant', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 253, 'bleu_score': 0.8302012483091991, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 15801389327963030773}, 'section': 'Section::::Abstract.'}]}]