Question: in a solution of brine what is the salt
[{'answer': 'usually sodium chloride', 'provenance': [{'wikipedia_id': '70663', 'title': 'Brine', 'start_paragraph_id': 4, 'start_character': 57, 'end_paragraph_id': 4, 'end_character': 80, 'bleu_score': 1.0, 'section': 'Section::::In nature.\n'}]}, {'provenance': [{'wikipedia_id': '70663', 'title': 'Brine', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 410, 'bleu_score': 0.9046409161882281, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 6216748220972070991}, 'section': 'Section::::Abstract.'}]}]