Question: what part of a chicken is the keel
[{'answer': 'an extension of the sternum', 'provenance': [{'wikipedia_id': '1451161', 'title': 'Keel (bird anatomy)', 'start_paragraph_id': 1, 'start_character': 53, 'end_paragraph_id': 1, 'end_character': 80, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '1451161', 'title': 'Keel (bird anatomy)', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 413, 'bleu_score': 0.9716239638199891, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 5051782603745335121}, 'section': 'Section::::Abstract.'}]}]