Question: how many graves are in jefferson barracks national cemetery
[{'answer': 'approximately 188,000', 'provenance': [{'wikipedia_id': '2020545', 'title': 'Jefferson Barracks National Cemetery', 'start_paragraph_id': 3, 'start_character': 162, 'end_paragraph_id': 3, 'end_character': 183, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '2020545', 'title': 'Jefferson Barracks National Cemetery', 'start_paragraph_id': 3, 'start_character': 0, 'end_paragraph_id': 3, 'end_character': 251, 'bleu_score': 0.8339679065405731, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 831834269782892497}, 'section': 'Section::::Abstract.'}]}]