Question: which country supported the republican forces with military aid in the spanish civil war
[{'answer': 'Soviet Union', 'provenance': [{'wikipedia_id': '18842471', 'title': 'Spanish Civil War', 'start_paragraph_id': 4, 'start_character': 637, 'end_paragraph_id': 4, 'end_character': 649, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'Mexico', 'provenance': [{'wikipedia_id': '18842471', 'title': 'Spanish Civil War', 'start_paragraph_id': 4, 'start_character': 654, 'end_paragraph_id': 4, 'end_character': 660, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '18842471', 'title': 'Spanish Civil War', 'start_paragraph_id': 4, 'start_character': 0, 'end_paragraph_id': 4, 'end_character': 718, 'bleu_score': 0.8143663382310321, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 8025950071337056953}, 'section': 'Section::::Abstract.'}]}]