Question: when did they finish building the sydney harbour bridge
[{'answer': '19 January 1932', 'provenance': [{'wikipedia_id': '28267', 'title': 'Sydney Harbour Bridge', 'start_paragraph_id': 41, 'start_character': 3, 'end_paragraph_id': 41, 'end_character': 18, 'bleu_score': 1.0, 'section': 'Section::::History.:Construction.\n'}]}]