Question: what is a supreme court justices term of office
[{'answer': 'lifetime', 'provenance': [{'wikipedia_id': '31737', 'title': 'Supreme Court of the United States', 'start_paragraph_id': 2, 'start_character': 145, 'end_paragraph_id': 2, 'end_character': 153, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]