Question: who was the king at the time of the magna carta
[{'answer': 'King John', 'provenance': [{'wikipedia_id': '20958', 'title': 'Magna Carta', 'start_paragraph_id': 7, 'start_character': 205, 'end_paragraph_id': 7, 'end_character': 214, 'bleu_score': 1.0, 'section': 'Section::::History.:13th century.:Background.\n'}]}, {'provenance': [{'wikipedia_id': '20958', 'title': 'Magna Carta', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 841, 'bleu_score': 0.5079688817487791, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 15853878292680831714}, 'section': 'Section::::Abstract.'}]}]