Question: what holds the sister chromatids together and attaches them to the spindle fibers
[{'answer': 'kinetochore', 'provenance': [{'wikipedia_id': '998893', 'title': 'Kinetochore', 'start_paragraph_id': 1, 'start_character': 2, 'end_paragraph_id': 1, 'end_character': 13, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]