Question: when was the london natural history museum built
[{'answer': '1881', 'provenance': [{'wikipedia_id': '310411', 'title': 'Natural History Museum, London', 'start_paragraph_id': 3, 'start_character': 318, 'end_paragraph_id': 3, 'end_character': 322, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '310411', 'title': 'Natural History Museum, London', 'start_paragraph_id': 3, 'start_character': 0, 'end_paragraph_id': 3, 'end_character': 487, 'bleu_score': 0.972782728923768, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 4866513491443111566}, 'section': 'Section::::Abstract.'}]}]