Question: when did the united states drop the bomb on hiroshima
[{'answer': '1945', 'provenance': [{'wikipedia_id': '11778948', 'title': 'Atomic bombings of Hiroshima and Nagasaki', 'start_paragraph_id': 1, 'start_character': 118, 'end_paragraph_id': 1, 'end_character': 122, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '11778948', 'title': 'Atomic bombings of Hiroshima and Nagasaki', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 349, 'bleu_score': 0.6013708845007171, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 6166217817465322449}, 'section': 'Section::::Abstract.'}]}]