Question: who was the explorer that reached the cape of good hope at the southern tip of africa
[{'answer': 'Bartolomeu Dias', 'provenance': [{'wikipedia_id': '44252', 'title': 'Cape of Good Hope', 'start_paragraph_id': 3, 'start_character': 257, 'end_paragraph_id': 3, 'end_character': 272, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '44252', 'title': 'Cape of Good Hope', 'start_paragraph_id': 3, 'start_character': 0, 'end_paragraph_id': 3, 'end_character': 579, 'bleu_score': 0.9450701851959151, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 2757287641913657750}, 'section': 'Section::::Abstract.'}]}]