Question: when was the eiffel tower built and finished
[{'answer': '1887 -- 89'}, {'provenance': [{'wikipedia_id': '9232', 'title': 'Eiffel Tower', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 383, 'bleu_score': 0.8965921584388571, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 615156725316444199}, 'section': 'Section::::Abstract.'}]}]