Question: a cold front brings what type of weather
[{'answer': 'rain', 'provenance': [{'wikipedia_id': '20279444', 'title': 'Cold front', 'start_paragraph_id': 1, 'start_character': 460, 'end_paragraph_id': 1, 'end_character': 464, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'thunderstorms', 'provenance': [{'wikipedia_id': '20279444', 'title': 'Cold front', 'start_paragraph_id': 1, 'start_character': 568, 'end_paragraph_id': 1, 'end_character': 581, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '20279444', 'title': 'Cold front', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 852, 'bleu_score': 0.7631285265045781, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 1118469181937856095}, 'section': 'Section::::Abstract.'}]}]