Question: how long does it take for castration bands to work
[{'answer': 'a few weeks', 'provenance': [{'wikipedia_id': '14775368', 'title': 'Elastration', 'start_paragraph_id': 5, 'start_character': 416, 'end_paragraph_id': 5, 'end_character': 427, 'bleu_score': 1.0, 'section': 'Section::::Castration.:Procedure.\n'}]}, {'provenance': [{'wikipedia_id': '14775368', 'title': 'Elastration', 'start_paragraph_id': 5, 'start_character': 0, 'end_paragraph_id': 5, 'end_character': 1320, 'bleu_score': 0.9645779890078771, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 8003402838920184281}, 'section': 'Section::::Castration.:Procedure.\n'}]}]