Question: when did worl war 2 start and end
[{'answer': '1939', 'provenance': [{'wikipedia_id': '32927', 'title': 'World War II', 'start_paragraph_id': 1, 'start_character': 119, 'end_paragraph_id': 1, 'end_character': 123, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': '1945', 'provenance': [{'wikipedia_id': '32927', 'title': 'World War II', 'start_paragraph_id': 1, 'start_character': 127, 'end_paragraph_id': 1, 'end_character': 131, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '32927', 'title': 'World War II', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 885, 'bleu_score': 0.7515649502326911, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 6294340665630580149}, 'section': 'Section::::Abstract.'}]}]