Question: the fibrous sac covering of the heart which is in contact with the pleura is the
[{'answer': 'The pericardium', 'provenance': [{'wikipedia_id': '244944', 'title': 'Pericardium', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 15, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '244944', 'title': 'Pericardium', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 235, 'bleu_score': 0.9493253852526031, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 13531054641886771866}, 'section': 'Section::::Abstract.'}]}]