Question: who discovered sea route from europe to america
[{'answer': 'Columbus', 'provenance': [{'wikipedia_id': '7375831', 'title': 'Voyages of Christopher Columbus', 'start_paragraph_id': 0, 'start_character': 23, 'end_paragraph_id': 0, 'end_character': 31, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'Leif Erikson', 'provenance': [{'wikipedia_id': '7375831', 'title': 'Voyages of Christopher Columbus', 'start_paragraph_id': 2, 'start_character': 262, 'end_paragraph_id': 2, 'end_character': 274, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '7375831', 'title': 'Voyages of Christopher Columbus', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 458, 'bleu_score': 0.775370691590171, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 7273492059163916862}, 'section': 'Section::::Abstract.'}]}]