Question: who worked with manned gliders in the 1890's
[{'answer': 'Otto Lilienthal', 'provenance': [{'wikipedia_id': '360887', 'title': 'Otto Lilienthal', 'start_paragraph_id': 0, 'start_character': 0, 'end_paragraph_id': 0, 'end_character': 15, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '360887', 'title': 'Otto Lilienthal', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 568, 'bleu_score': 0.9396430371117861, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 9540789806074038911}, 'section': 'Section::::Abstract.'}]}]