Question: who threw off the rule of the mongols
[{'answer': 'Rus', 'provenance': [{'wikipedia_id': '45028', 'title': "Mongol invasion of Kievan Rus'", 'start_paragraph_id': 0, 'start_character': 26, 'end_paragraph_id': 0, 'end_character': 29, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '45028', 'title': "Mongol invasion of Kievan Rus'", 'start_paragraph_id': 21, 'start_character': 0, 'end_paragraph_id': 21, 'end_character': 226, 'bleu_score': 0.948006874591591, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 15842700237483702398}, 'section': 'Section::::Impact on development.\n'}]}]