Question: when did they start building the sagrada familia
[{'answer': '1882', 'provenance': [{'wikipedia_id': '59545', 'title': 'Sagrada Família', 'start_paragraph_id': 2, 'start_character': 3, 'end_paragraph_id': 2, 'end_character': 7, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]