Question: what can lower the freezing point of water
[{'answer': 'salt', 'provenance': [{'wikipedia_id': '607495', 'title': 'Freezing-point depression', 'start_paragraph_id': 1, 'start_character': 136, 'end_paragraph_id': 1, 'end_character': 140, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'alcohol', 'provenance': [{'wikipedia_id': '607495', 'title': 'Freezing-point depression', 'start_paragraph_id': 1, 'start_character': 151, 'end_paragraph_id': 1, 'end_character': 158, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '607495', 'title': 'Freezing-point depression', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 618, 'bleu_score': 0.8802179122505661, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 4699748434962376139}, 'section': 'Section::::Abstract.'}]}]