Question: apartheid ended in south africa during the presidency of
[{'answer': 'Mandela', 'provenance': [{'wikipedia_id': '2200527', 'title': 'Apartheid', 'start_paragraph_id': 6, 'start_character': 261, 'end_paragraph_id': 6, 'end_character': 268, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '2200527', 'title': 'Apartheid', 'start_paragraph_id': 208, 'start_character': 0, 'end_paragraph_id': 208, 'end_character': 759, 'bleu_score': 0.915321188478161, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 16315755430177555241}, 'section': 'Section::::Final years of apartheid.:1994 election.\n'}]}]