Question: who was involved in building the eiffel tower
[{'answer': 'Gustave Eiffel', 'provenance': [{'wikipedia_id': '9232', 'title': 'Eiffel Tower', 'start_paragraph_id': 1, 'start_character': 125, 'end_paragraph_id': 1, 'end_character': 139, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '9232', 'title': 'Eiffel Tower', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 183, 'bleu_score': 0.621975521477779, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 1763619633220669942}, 'section': 'Section::::Abstract.'}]}]