Question: where was the first pan african conference held
[{'answer': 'in London', 'provenance': [{'wikipedia_id': '37398011', 'title': 'First Pan-African Conference', 'start_paragraph_id': 1, 'start_character': 42, 'end_paragraph_id': 1, 'end_character': 51, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '37398011', 'title': 'First Pan-African Conference', 'start_paragraph_id': 1, 'start_character': 4, 'end_paragraph_id': 1, 'end_character': 967, 'bleu_score': 0.9538513579280921, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 7311732976114719525}, 'section': 'Section::::Abstract.'}]}]