Question: name the continent with which north america has a land link
[{'answer': 'South America', 'provenance': [{'wikipedia_id': '21139', 'title': 'North America', 'start_paragraph_id': 1, 'start_character': 344, 'end_paragraph_id': 1, 'end_character': 357, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '21139', 'title': 'North America', 'start_paragraph_id': 35, 'start_character': 0, 'end_paragraph_id': 35, 'end_character': 1004, 'bleu_score': 0.9642418789456221, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 46150891465721671}, 'section': 'Section::::Geography.\n'}]}]