Question: who discovered the source of the nile river
[{'answer': 'Jesuit Pedro Páez', 'provenance': [{'wikipedia_id': '21244', 'title': 'Nile', 'start_paragraph_id': 63, 'start_character': 543, 'end_paragraph_id': 63, 'end_character': 560, 'bleu_score': 1.0, 'section': 'Section::::History.:Search for the source of the Nile.\n'}]}, {'provenance': [{'wikipedia_id': '21244', 'title': 'Nile', 'start_paragraph_id': 63, 'start_character': 200, 'end_paragraph_id': 63, 'end_character': 836, 'bleu_score': 0.8899301236379931, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 4464302340917972042}, 'section': 'Section::::History.:Search for the source of the Nile.\n'}]}]