Question: in what year did japan attack pearl harbor
[{'answer': '1941', 'provenance': [{'wikipedia_id': '60098', 'title': 'Attack on Pearl Harbor', 'start_paragraph_id': 1, 'start_character': 245, 'end_paragraph_id': 1, 'end_character': 249, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '60098', 'title': 'Attack on Pearl Harbor', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 469, 'bleu_score': 0.668660986674489, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 1793677530916691218}, 'section': 'Section::::Abstract.'}]}]