Question: who sponsored portuguese fleets that sailed along the western coast of africa
[{'answer': 'prince Henry the Navigator', 'provenance': [{'wikipedia_id': '14346997', 'title': 'Portuguese discoveries', 'start_paragraph_id': 1, 'start_character': 514, 'end_paragraph_id': 1, 'end_character': 540, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '14346997', 'title': 'Portuguese discoveries', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 1034, 'bleu_score': 0.9874601949752461, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 11445090353943582280}, 'section': 'Section::::Abstract.'}]}]