Question: how many african countries are there in the world
[{'answer': '54', 'provenance': [{'wikipedia_id': '5334607', 'title': 'Africa', 'start_paragraph_id': 2, 'start_character': 358, 'end_paragraph_id': 2, 'end_character': 360, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '5334607', 'title': 'Africa', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 605, 'bleu_score': 0.548272345331961, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 5376942057766862145}, 'section': 'Section::::Abstract.'}]}]