Question: when did hearst castle open to the public
[{'answer': '1958', 'provenance': [{'wikipedia_id': '366562', 'title': 'Hearst Castle', 'start_paragraph_id': 4, 'start_character': 135, 'end_paragraph_id': 4, 'end_character': 139, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]