Question: when was the silk road made in china
[{'answer': '114 BCE', 'provenance': [{'wikipedia_id': '54253', 'title': 'Silk Road', 'start_paragraph_id': 2, 'start_character': 228, 'end_paragraph_id': 2, 'end_character': 235, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]