Question: who started building the great wall of china
[{'answer': 'General Nan Zhong', 'provenance': [{'wikipedia_id': '34476548', 'title': 'History of the Great Wall of China', 'start_paragraph_id': 14, 'start_character': 279, 'end_paragraph_id': 14, 'end_character': 296, 'bleu_score': 1.0, 'section': 'Section::::Pre-imperial China (7th century–221 BC).\n'}]}, {'provenance': [{'wikipedia_id': '34476548', 'title': 'History of the Great Wall of China', 'start_paragraph_id': 14, 'start_character': 11, 'end_paragraph_id': 14, 'end_character': 2215, 'bleu_score': 0.8977169519673691, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 9999169330474049413}, 'section': 'Section::::Pre-imperial China (7th century–221 BC).\n'}]}]