Question: when was nanjing(nanking) selected as the capital city of the republic of china
[{'answer': '317', 'provenance': [{'wikipedia_id': '21791', 'title': 'Nanjing', 'start_paragraph_id': 4, 'start_character': 501, 'end_paragraph_id': 4, 'end_character': 504, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '21791', 'title': 'Nanjing', 'start_paragraph_id': 14, 'start_character': 0, 'end_paragraph_id': 14, 'end_character': 544, 'bleu_score': 0.8536637436278731, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 3770505044432651930}, 'section': 'Section::::History.:Capital of the Six Dynasties.\n'}]}]