Question: who was involved in the treaty of brest-litovsk
[{'answer': 'Soviet Russia', 'provenance': [{'wikipedia_id': '31388', 'title': 'Treaty of Brest-Litovsk', 'start_paragraph_id': 1, 'start_character': 530, 'end_paragraph_id': 1, 'end_character': 543, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'Germany', 'provenance': [{'wikipedia_id': '31388', 'title': 'Treaty of Brest-Litovsk', 'start_paragraph_id': 2, 'start_character': 63, 'end_paragraph_id': 2, 'end_character': 70, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'Austria - Hungary', 'provenance': [{'wikipedia_id': '31388', 'title': 'Treaty of Brest-Litovsk', 'start_paragraph_id': 27, 'start_character': 36, 'end_paragraph_id': 27, 'end_character': 58, 'bleu_score': 1.0, 'section': 'Section::::Terms of the treaty.:Territorial cessions in eastern Europe.\n'}]}, {'answer': 'Bulgaria', 'provenance': [{'wikipedia_id': '31388', 'title': 'Treaty of Brest-Litovsk', 'start_paragraph_id': 1, 'start_character': 216, 'end_paragraph_id': 1, 'end_character': 224, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'Ottoman Empire', 'provenance': [{'wikipedia_id': '31388', 'title': 'Treaty of Brest-Litovsk', 'start_paragraph_id': 1, 'start_character': 234, 'end_paragraph_id': 1, 'end_character': 248, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '31388', 'title': 'Treaty of Brest-Litovsk', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 611, 'bleu_score': 0.6546045612465681, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 7657560896240714872}, 'section': 'Section::::Abstract.'}]}]