Question: what was the nickname of the atomic bomb dropped on hiroshima
[{'answer': "`` Little Boy ''"}, {'provenance': [{'wikipedia_id': '18597', 'title': 'Little Boy', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 618, 'bleu_score': 0.6650494132100551, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 12772470835083128047}, 'section': 'Section::::Abstract.'}]}]