Question: how many subway are there in the us
[{'answer': 'about 26,400'}, {'provenance': [{'wikipedia_id': '54581', 'title': 'Subway (restaurant)', 'start_paragraph_id': 17, 'start_character': 0, 'end_paragraph_id': 17, 'end_character': 498, 'bleu_score': 0.755934790543007, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 6612699289656159854}, 'section': 'Section::::Locations.\n'}]}]