Question: who designed st paul's cathedral in london
[{'answer': 'Sir Christopher Wren', 'provenance': [{'wikipedia_id': '102198', 'title': "St Paul's Cathedral", 'start_paragraph_id': 1, 'start_character': 442, 'end_paragraph_id': 1, 'end_character': 462, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '102198', 'title': "St Paul's Cathedral", 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 595, 'bleu_score': 0.9583546176158331, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 17675279786409742730}, 'section': 'Section::::Abstract.'}]}]