Question: who decides if a case goes to grand jury
[{'answer': 'prosecutor', 'provenance': [{'wikipedia_id': '34323893', 'title': 'Grand juries in the United States', 'start_paragraph_id': 5, 'start_character': 1281, 'end_paragraph_id': 5, 'end_character': 1291, 'bleu_score': 1.0, 'section': 'Section::::History.\n'}]}, {'provenance': [{'wikipedia_id': '34323893', 'title': 'Grand juries in the United States', 'start_paragraph_id': 15, 'start_character': 0, 'end_paragraph_id': 15, 'end_character': 1110, 'bleu_score': 0.9891594913313011, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 12850546760673081566}, 'section': 'Section::::Federal law.:Secrecy.\n'}]}]