Question: what year did toys r us open their doors
[{'answer': 'June 1957', 'provenance': [{'wikipedia_id': '509306', 'title': 'Toys "R" Us', 'start_paragraph_id': 2, 'start_character': 54, 'end_paragraph_id': 2, 'end_character': 63, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]