Question: who was involved in the council of nicaea
[{'answer': 'Christian bishops', 'provenance': [{'wikipedia_id': '11118', 'title': 'First Council of Nicaea', 'start_paragraph_id': 1, 'start_character': 50, 'end_paragraph_id': 1, 'end_character': 67, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'the Roman Emperor Constantine I', 'provenance': [{'wikipedia_id': '11118', 'title': 'First Council of Nicaea', 'start_paragraph_id': 1, 'start_character': 148, 'end_paragraph_id': 1, 'end_character': 179, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]