Question: when was the flag raised on iwo jima
[{'answer': 'February 25 , 1945', 'provenance': [{'wikipedia_id': '450590', 'title': 'Raising the Flag on Iwo Jima', 'start_paragraph_id': 1, 'start_character': 284, 'end_paragraph_id': 1, 'end_character': 302, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '450590', 'title': 'Raising the Flag on Iwo Jima', 'start_paragraph_id': 1, 'start_character': 223, 'end_paragraph_id': 1, 'end_character': 602, 'bleu_score': 0.968982777549629, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 2278615958130399925}, 'section': 'Section::::Abstract.'}]}]