Question: in what region of the united states were totem poles common forms of native american art
[{'answer': 'Northwest Coast', 'provenance': [{'wikipedia_id': '74142', 'title': 'Totem pole', 'start_paragraph_id': 1, 'start_character': 81, 'end_paragraph_id': 1, 'end_character': 96, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '74142', 'title': 'Totem pole', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 749, 'bleu_score': 0.6176233252360911, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 5675566389783685844}, 'section': 'Section::::Abstract.'}]}]