Question: is cream of tartar an acid or base
[{'answer': 'acid', 'provenance': [{'wikipedia_id': '720240', 'title': 'Potassium bitartrate', 'start_paragraph_id': 1, 'start_character': 192, 'end_paragraph_id': 1, 'end_character': 196, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '720240', 'title': 'Potassium bitartrate', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 387, 'bleu_score': 0.8188912486105371, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 4256707706212048243}, 'section': 'Section::::Abstract.'}]}]