Question: what is the length of the chesapeake bay bridge tunnel
[{'answer': '23 - mile'}, {'provenance': [{'wikipedia_id': '885929', 'title': 'Chesapeake Bay Bridge–Tunnel', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 1218, 'bleu_score': 0.843541548426995, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 2836084987410651179}, 'section': 'Section::::Abstract.'}]}]