Question: who is the current african nations cup champion
[{'answer': 'Cameroon', 'provenance': [{'wikipedia_id': '250680', 'title': 'Africa Cup of Nations', 'start_paragraph_id': 4, 'start_character': 280, 'end_paragraph_id': 4, 'end_character': 288, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]