Question: which alliance was formed as a reaction to the north atlantic treaty organization (nato)
[{'answer': 'North Atlantic Alliance', 'provenance': [{'wikipedia_id': '21133', 'title': 'NATO', 'start_paragraph_id': 1, 'start_character': 69, 'end_paragraph_id': 1, 'end_character': 92, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '21133', 'title': 'NATO', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 565, 'bleu_score': 0.86459003657885, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 4796253216968952646}, 'section': 'Section::::Abstract.'}]}]