Question: which important war conference demanded the unconditional surrender of japan
[{'answer': 'Potsdam Declaration', 'provenance': [{'wikipedia_id': '2395137', 'title': 'Surrender of Japan', 'start_paragraph_id': 1, 'start_character': 452, 'end_paragraph_id': 1, 'end_character': 471, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '2395137', 'title': 'Surrender of Japan', 'start_paragraph_id': 1, 'start_character': 58, 'end_paragraph_id': 1, 'end_character': 1244, 'bleu_score': 0.8416833108470371, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 9715309115584027876}, 'section': 'Section::::Abstract.'}]}]