Question: who invaded the island of iwo jima japan
[{'answer': 'the United States Marine Corps', 'provenance': [{'wikipedia_id': '60027', 'title': 'Battle of Iwo Jima', 'start_paragraph_id': 1, 'start_character': 81, 'end_paragraph_id': 1, 'end_character': 111, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '60027', 'title': 'Battle of Iwo Jima', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 617, 'bleu_score': 0.965324401462693, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 7587905063517310400}, 'section': 'Section::::Abstract.'}]}]