Question: new york heart association functional classification of angina
[{'answer': 'II'}, {'provenance': [{'wikipedia_id': '506072', 'title': 'New York Heart Association Functional Classification', 'start_paragraph_id': 0, 'start_character': 0, 'end_paragraph_id': 0, 'end_character': 0, 'bleu_score': 1.0, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 1422725142617194682}, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '65862', 'title': 'Angina', 'section': 'Section::::Abstract.', 'start_paragraph_id': 4, 'end_paragraph_id': 4, 'meta': {'evidence_span': ['usually', 'People with an average age of 62 years, who have moderate to severe degrees of angina (grading by classes II, III, and IV) have a 5-year survival rate of approximately 92%. Worsening angina attacks, sudden-onset angina at rest, and angina lasting more than 15 minutes are symptoms of "unstable angina" (usually grouped with similar conditions as the acute coronary syndrome). As these may precede a heart attack, they require urgent medical attention and are, in general, treated in similar fashion to myocardial infarction.']}}]}]