Question: who assassinated the heir to the austro-hungarian throne
[{'answer': 'Gavrilo Princip', 'provenance': [{'wikipedia_id': '8961317', 'title': 'Assassination of Archduke Franz Ferdinand', 'start_paragraph_id': 1, 'start_character': 236, 'end_paragraph_id': 1, 'end_character': 251, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '8961317', 'title': 'Assassination of Archduke Franz Ferdinand', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 926, 'bleu_score': 0.9017507531283591, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 3259731503590985706}, 'section': 'Section::::Abstract.'}]}]