Question: when did man utd move to old trafford
[{'answer': 'on 21 August 1935', 'provenance': [{'wikipedia_id': '660592', 'title': 'Old Trafford', 'start_paragraph_id': 8, 'start_character': 1071, 'end_paragraph_id': 8, 'end_character': 1088, 'bleu_score': 1.0, 'section': 'Section::::History.:Construction and early years.\n'}]}, {'provenance': [{'wikipedia_id': '660592', 'title': 'Old Trafford', 'start_paragraph_id': 8, 'start_character': 0, 'end_paragraph_id': 8, 'end_character': 1366, 'bleu_score': 0.991471020640276, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 4299036288611800628}, 'section': 'Section::::History.:Construction and early years.\n'}]}]