Question: who killed king robert in game of thrones
[{'answer': 'Cersei', 'provenance': [{'wikipedia_id': '1174910', 'title': 'Robert Baratheon', 'start_paragraph_id': 2, 'start_character': 771, 'end_paragraph_id': 2, 'end_character': 777, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '1174910', 'title': 'Robert Baratheon', 'start_paragraph_id': 15, 'start_character': 16, 'end_paragraph_id': 15, 'end_character': 864, 'bleu_score': 0.501531713251221, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 2391272081646454547}, 'section': 'Section::::Storylines.:"A Game of Thrones".\n'}]}]