Question: who led a three-year expedition around the world
[{'answer': 'Vasco da Gama', 'provenance': [{'wikipedia_id': '45080', 'title': 'Vasco da Gama', 'start_paragraph_id': 0, 'start_character': 0, 'end_paragraph_id': 0, 'end_character': 13, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '45080', 'title': 'Vasco da Gama', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 325, 'bleu_score': 0.809424875853564, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 11964105064561807094}, 'section': 'Section::::Abstract.'}]}]