Question: what muscle attach to the chordae tendineae to hold the valves in place
[{'answer': 'the papillary muscles', 'provenance': [{'wikipedia_id': '1929167', 'title': 'Chordae tendineae', 'start_paragraph_id': 1, 'start_character': 152, 'end_paragraph_id': 1, 'end_character': 173, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '1929167', 'title': 'Chordae tendineae', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 232, 'bleu_score': 0.896677340076891, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 10534415355946263596}, 'section': 'Section::::Abstract.'}]}]