Question: first degree av block seen in which area
[{'answer': 'the atrioventricular node', 'provenance': [{'wikipedia_id': '665829', 'title': 'First-degree atrioventricular block', 'start_paragraph_id': 2, 'start_character': 82, 'end_paragraph_id': 2, 'end_character': 107, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '665829', 'title': 'First-degree atrioventricular block', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 275, 'bleu_score': 0.9569637990759251, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 7812462694964691718}, 'section': 'Section::::Abstract.'}]}]