Question: what is the life expectancy of a chesapeake bay retriever
[{'answer': 'average lifespan at 9.4 years', 'provenance': [{'wikipedia_id': '203745', 'title': 'Chesapeake Bay Retriever', 'start_paragraph_id': 21, 'start_character': 125, 'end_paragraph_id': 21, 'end_character': 154, 'bleu_score': 1.0, 'section': 'Section::::Health.\n'}]}, {'provenance': [{'wikipedia_id': '203745', 'title': 'Chesapeake Bay Retriever', 'start_paragraph_id': 21, 'start_character': 0, 'end_paragraph_id': 21, 'end_character': 225, 'bleu_score': 0.958740481558872, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 1484952735860524449}, 'section': 'Section::::Health.\n'}]}]