Question: in an election what is the person who already holds an office
[{'answer': 'incumbent', 'provenance': [{'wikipedia_id': '364022', 'title': 'Incumbent', 'start_paragraph_id': 1, 'start_character': 4, 'end_paragraph_id': 1, 'end_character': 13, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '364022', 'title': 'Incumbent', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 457, 'bleu_score': 0.838474911669519, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 11422116671981890026}, 'section': 'Section::::Abstract.'}]}]