Question: what kind of bomb was used in hiroshima
[{'answer': 'nuclear', 'provenance': [{'wikipedia_id': '11778948', 'title': 'Atomic bombings of Hiroshima and Nagasaki', 'start_paragraph_id': 1, 'start_character': 32, 'end_paragraph_id': 1, 'end_character': 39, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '11778948', 'title': 'Atomic bombings of Hiroshima and Nagasaki', 'start_paragraph_id': 65, 'start_character': 0, 'end_paragraph_id': 65, 'end_character': 582, 'bleu_score': 0.8715934312512771, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 7527760271429699495}, 'section': 'Section::::Hiroshima.:Bombing of Hiroshima.\n'}]}]