Question: how many stores does walmart have in usa
[{'answer': '4,761'}, {'provenance': [{'wikipedia_id': '33589', 'title': 'Walmart', 'start_paragraph_id': 51, 'start_character': 0, 'end_paragraph_id': 51, 'end_character': 511, 'bleu_score': 0.7209919842954821, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 2237906643787696116}, 'section': 'Section::::Operating divisions.:Walmart U.S..\n'}]}]