Question: what is the name of sierra leone president
[{'answer': 'Julius Maada Bio', 'provenance': [{'wikipedia_id': '450108', 'title': 'President of Sierra Leone', 'start_paragraph_id': 6, 'start_character': 548, 'end_paragraph_id': 6, 'end_character': 564, 'bleu_score': 1.0, 'section': 'Section::::Election.\n'}]}, {'provenance': [{'wikipedia_id': '450108', 'title': 'President of Sierra Leone', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 594, 'bleu_score': 0.771900617703939, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 15698499958492274514}, 'section': 'Section::::Abstract.'}]}]