Question: who was the first greek explorer to reach the arctic
[{'answer': 'Pytheas', 'provenance': [{'wikipedia_id': '25437008', 'title': 'Arctic exploration', 'start_paragraph_id': 1, 'start_character': 312, 'end_paragraph_id': 1, 'end_character': 319, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '25437008', 'title': 'Arctic exploration', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 576, 'bleu_score': 0.978138775770484, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 17215741805910739305}, 'section': 'Section::::Abstract.'}]}]