Question: what landform region is the geological foundation of canada
[{'answer': 'Canadian Shield', 'provenance': [{'wikipedia_id': '6230', 'title': 'Canadian Shield', 'start_paragraph_id': 0, 'start_character': 0, 'end_paragraph_id': 0, 'end_character': 15, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '6230', 'title': 'Canadian Shield', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 725, 'bleu_score': 0.9530446225172671, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 11003219328697957636}, 'section': 'Section::::Abstract.'}]}]