Question: who wrote the book they came before columbus
[{'answer': 'Ivan Gladstone Van Sertima', 'provenance': [{'wikipedia_id': '2757924', 'title': 'Ivan Van Sertima', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 26, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '2757924', 'title': 'Ivan Van Sertima', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 161, 'bleu_score': 0.9243880458347601, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 7342698446944348919}, 'section': 'Section::::Abstract.'}]}]