Question: ice sheets and tundra are typical of which koppen climate category
[{'answer': 'polar', 'provenance': [{'wikipedia_id': '484254', 'title': 'Köppen climate classification', 'start_paragraph_id': 2, 'start_character': 267, 'end_paragraph_id': 2, 'end_character': 272, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '484254', 'title': 'Köppen climate classification', 'start_paragraph_id': 216, 'start_character': 0, 'end_paragraph_id': 216, 'end_character': 207, 'bleu_score': 0.9466178497997021, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 7883061388630450403}, 'section': 'Section::::Group E: Polar climates.\n'}]}]