Question: a sound of thunder what is the sound of thunder at the end of the story
[{'answer': 'gun', 'provenance': [{'wikipedia_id': '914792', 'title': 'A Sound of Thunder', 'start_paragraph_id': 5, 'start_character': 682, 'end_paragraph_id': 5, 'end_character': 685, 'bleu_score': 1.0, 'section': 'Section::::Plot summary.\n'}]}, {'provenance': [{'wikipedia_id': '914792', 'title': 'A Sound of Thunder', 'start_paragraph_id': 5, 'start_character': 0, 'end_paragraph_id': 5, 'end_character': 719, 'bleu_score': 0.8980509793628411, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 14851003522693301530}, 'section': 'Section::::Plot summary.\n'}]}]