Question: when was the last time nasa landed on the moon
[{'answer': 'December 1972', 'provenance': [{'wikipedia_id': '1558077', 'title': 'Moon landing', 'start_paragraph_id': 3, 'start_character': 152, 'end_paragraph_id': 3, 'end_character': 165, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '1558077', 'title': 'Moon landing', 'start_paragraph_id': 3, 'start_character': 0, 'end_paragraph_id': 3, 'end_character': 165, 'bleu_score': 0.8390782502060261, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 4405651868763923006}, 'section': 'Section::::Abstract.'}]}]