Question: how many judges currently serve on the supreme court
[{'answer': 'nine', 'provenance': [{'wikipedia_id': '31737', 'title': 'Supreme Court of the United States', 'start_paragraph_id': 27, 'start_character': 517, 'end_paragraph_id': 27, 'end_character': 521, 'bleu_score': 1.0, 'section': 'Section::::Composition.:Size of the court.\n'}]}]