Question: who picks chief justice of the supreme court
[{'answer': 'the President', 'provenance': [{'wikipedia_id': '31739', 'title': 'Chief Justice of the United States', 'start_paragraph_id': 6, 'start_character': 154, 'end_paragraph_id': 6, 'end_character': 167, 'bleu_score': 1.0, 'section': 'Section::::Origin, title, and appointment to office.\n'}]}, {'provenance': [{'wikipedia_id': '31739', 'title': 'Chief Justice of the United States', 'start_paragraph_id': 8, 'start_character': 0, 'end_paragraph_id': 8, 'end_character': 440, 'bleu_score': 0.909930230187989, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 16247652378513174668}, 'section': 'Section::::Origin, title, and appointment to office.\n'}]}]