Question: what is the main purpose of the sydney opera house
[{'answer': 'Performing arts centre', 'provenance': [{'wikipedia_id': '28222', 'title': 'Sydney Opera House', 'start_paragraph_id': 1, 'start_character': 40, 'end_paragraph_id': 1, 'end_character': 62, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]