Question: what caused the collapse of the han dynasty
[{'answer': 'Yellow Turban Rebellion', 'provenance': [{'wikipedia_id': '3034202', 'title': 'End of the Han dynasty', 'start_paragraph_id': 1, 'start_character': 247, 'end_paragraph_id': 1, 'end_character': 270, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '3034202', 'title': 'End of the Han dynasty', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 730, 'bleu_score': 0.5204773475289151, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 1668675244162353305}, 'section': 'Section::::Abstract.'}]}]