Question: when was the last time us went to moon
[{'answer': '7 September 2013', 'provenance': [{'wikipedia_id': '1558077', 'title': 'Moon landing', 'start_paragraph_id': 113, 'start_character': 22, 'end_paragraph_id': 113, 'end_character': 38, 'bleu_score': 1.0, 'section': 'Section::::Late 20th century–Early 21st century uncrewed crash landings.:LADEE (US).\n'}]}, {'provenance': [{'wikipedia_id': '1558077', 'title': 'Moon landing', 'start_paragraph_id': 113, 'start_character': 0, 'end_paragraph_id': 113, 'end_character': 244, 'bleu_score': 0.953991849837532, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 9519839233591857190}, 'section': 'Section::::Late 20th century–Early 21st century uncrewed crash landings.:LADEE (US).\n'}]}]