Question: who is heir to the throne of britain
[{'answer': 'Charles , Prince of Wales', 'provenance': [{'wikipedia_id': '879986', 'title': 'Succession to the British throne', 'start_paragraph_id': 2, 'start_character': 78, 'end_paragraph_id': 2, 'end_character': 103, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '879986', 'title': 'Succession to the British throne', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 597, 'bleu_score': 0.6583849251621191, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 14174707554004809331}, 'section': 'Section::::Abstract.'}]}]