Question: what type of bridge is the chengyang bridge
[{'answer': 'Covered bridge', 'provenance': [{'wikipedia_id': '25657144', 'title': 'Chengyang Bridge', 'start_paragraph_id': 2, 'start_character': 30, 'end_paragraph_id': 2, 'end_character': 44, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]