Question: who won the most african cup of nations
[{'answer': 'Egypt', 'provenance': [{'wikipedia_id': '250680', 'title': 'Africa Cup of Nations', 'start_paragraph_id': 2, 'start_character': 53, 'end_paragraph_id': 2, 'end_character': 58, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]