Question: where does the pericardium attached to the heart
[{'answer': 'mediastinum', 'provenance': [{'wikipedia_id': '244944', 'title': 'Pericardium', 'start_paragraph_id': 2, 'start_character': 39, 'end_paragraph_id': 2, 'end_character': 50, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '244944', 'title': 'Pericardium', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 221, 'bleu_score': 0.9402297675816911, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 18078586894196041478}, 'section': 'Section::::Abstract.'}]}]