Question: who is the designer of the piazza in front of st. peter's basilica
[{'answer': 'Gian Lorenzo Bernini', 'provenance': [{'wikipedia_id': '894041', 'title': "St. Peter's Square", 'start_paragraph_id': 2, 'start_character': 97, 'end_paragraph_id': 2, 'end_character': 117, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '894041', 'title': "St. Peter's Square", 'start_paragraph_id': 4, 'start_character': 0, 'end_paragraph_id': 4, 'end_character': 698, 'bleu_score': 0.8667134249755211, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 11352069393103884980}, 'section': 'Section::::History.\n'}]}]