Question: 49th parallel is the boundary line between which two nations
[{'answer': 'Canada', 'provenance': [{'wikipedia_id': '328341', 'title': '49th parallel north', 'start_paragraph_id': 3, 'start_character': 15, 'end_paragraph_id': 3, 'end_character': 21, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'United States', 'provenance': [{'wikipedia_id': '328341', 'title': '49th parallel north', 'start_paragraph_id': 3, 'start_character': 22, 'end_paragraph_id': 3, 'end_character': 35, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '328341', 'title': '49th parallel north', 'start_paragraph_id': 3, 'start_character': 0, 'end_paragraph_id': 3, 'end_character': 497, 'bleu_score': 0.8021062371038221, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 1174208783476200115}, 'section': 'Section::::Abstract.'}]}]