Question: when was berlin split into east and west
[{'answer': '1945', 'provenance': [{'wikipedia_id': '242099', 'title': 'History of Berlin', 'start_paragraph_id': 78, 'start_character': 29, 'end_paragraph_id': 78, 'end_character': 33, 'bleu_score': 1.0, 'section': 'Section::::Weimar Republic (1918–1933).\n'}]}, {'provenance': [{'wikipedia_id': '242099', 'title': 'History of Berlin', 'start_paragraph_id': 106, 'start_character': 0, 'end_paragraph_id': 106, 'end_character': 301, 'bleu_score': 0.958740481558872, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 10583525111888690303}, 'section': 'Section::::West and East Germany (1945–1990).\n'}]}]