Question: how long is the term of a president in the usa
[{'answer': 'four - year', 'provenance': [{'wikipedia_id': '10826158', 'title': 'Term of office', 'start_paragraph_id': 33, 'start_character': 55, 'end_paragraph_id': 33, 'end_character': 69, 'bleu_score': 1.0, 'section': 'Section::::United States.:State and territories.\n'}]}, {'provenance': [{'wikipedia_id': '10826158', 'title': 'Term of office', 'start_paragraph_id': 19, 'start_character': 0, 'end_paragraph_id': 19, 'end_character': 422, 'bleu_score': 0.9731482306711111, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 12325420740885230567}, 'section': 'Section::::United States.:Federal.\n'}]}]