Question: what was traded on the silk road in ancient china
[{'answer': 'silk', 'provenance': [{'wikipedia_id': '54253', 'title': 'Silk Road', 'start_paragraph_id': 2, 'start_character': 59, 'end_paragraph_id': 2, 'end_character': 63, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'horses', 'provenance': [{'wikipedia_id': '54253', 'title': 'Silk Road', 'start_paragraph_id': 11, 'start_character': 355, 'end_paragraph_id': 11, 'end_character': 361, 'bleu_score': 1.0, 'section': 'Section::::Precursors.:Chinese and Central Asian contacts (2nd millennium BCE).\n'}]}, {'provenance': [{'wikipedia_id': '54253', 'title': 'Silk Road', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 508, 'bleu_score': 0.6499341214099561, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 3550695131892519976}, 'section': 'Section::::Abstract.'}]}]