Question: what is the weapon with the ball and chain
[{'answer': 'flail', 'provenance': [{'wikipedia_id': '362771', 'title': 'Flail (weapon)', 'start_paragraph_id': 1, 'start_character': 2, 'end_paragraph_id': 1, 'end_character': 7, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '362771', 'title': 'Flail (weapon)', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 331, 'bleu_score': 0.57420066106931, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 13016113109908613567}, 'section': 'Section::::Abstract.'}]}]