Question: when was the bay bridge in maryland built
[{'answer': '1952', 'provenance': [{'wikipedia_id': '994429', 'title': 'Chesapeake Bay Bridge', 'start_paragraph_id': 1, 'start_character': 260, 'end_paragraph_id': 1, 'end_character': 264, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '994429', 'title': 'Chesapeake Bay Bridge', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 654, 'bleu_score': 0.8812302695441351, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 11364191351347999919}, 'section': 'Section::::Abstract.'}]}]