Question: in cold climates pot holes in the spring are most often caused by
[{'answer': 'frost heaving', 'provenance': [{'wikipedia_id': '679161', 'title': 'Pothole', 'start_paragraph_id': 4, 'start_character': 42, 'end_paragraph_id': 4, 'end_character': 55, 'bleu_score': 1.0, 'section': 'Section::::Formation.\n'}]}, {'provenance': [{'wikipedia_id': '679161', 'title': 'Pothole', 'start_paragraph_id': 4, 'start_character': 0, 'end_paragraph_id': 4, 'end_character': 344, 'bleu_score': 0.9657992495762461, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 7379106807191741733}, 'section': 'Section::::Formation.\n'}]}]