Question: when did the united states land on the moon
[{'answer': '20 July 1969', 'provenance': [{'wikipedia_id': '1558077', 'title': 'Moon landing', 'start_paragraph_id': 2, 'start_character': 82, 'end_paragraph_id': 2, 'end_character': 94, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '1558077', 'title': 'Moon landing', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 264, 'bleu_score': 0.7381723167990101, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 17220416808151394229}, 'section': 'Section::::Abstract.'}]}]