Question: who declared that every creature is subject to the pope for salvation
[{'answer': 'Pope Boniface VIII', 'provenance': [{'wikipedia_id': '482984', 'title': 'Unam sanctam', 'start_paragraph_id': 27, 'start_character': 12, 'end_paragraph_id': 27, 'end_character': 30, 'bleu_score': 1.0, 'section': 'Section::::External links.\n'}]}]