Question: what body of water forms canadas western coast
[{'answer': 'Pacific Ocean', 'provenance': [{'wikipedia_id': '26269656', 'title': 'Western Canada', 'start_paragraph_id': 17, 'start_character': 228, 'end_paragraph_id': 17, 'end_character': 241, 'bleu_score': 1.0, 'section': 'Section::::Geography.\n'}]}, {'provenance': [{'wikipedia_id': '26269656', 'title': 'Western Canada', 'start_paragraph_id': 17, 'start_character': 0, 'end_paragraph_id': 17, 'end_character': 416, 'bleu_score': 0.9684940092844061, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 14012409148793575421}, 'section': 'Section::::Geography.\n'}]}]