Question: when did the last manned moon landing occur
[{'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.'}]}]