Question: when did man last walk on the moon
[{'answer': '14 December 1972', 'provenance': [{'wikipedia_id': '1558077', 'title': 'Moon landing', 'start_paragraph_id': 13, 'start_character': 265, 'end_paragraph_id': 13, 'end_character': 281, 'bleu_score': 1.0, 'section': 'Section::::Crewed landings.\n'}]}, {'provenance': [{'wikipedia_id': '1558077', 'title': 'Moon landing', 'start_paragraph_id': 13, 'start_character': 0, 'end_paragraph_id': 13, 'end_character': 383, 'bleu_score': 0.8951543634794661, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 11023885052908533042}, 'section': 'Section::::Crewed landings.\n'}]}]