Question: what are the two dominant systems in the thoracic cavity
[{'answer': 'lymphatics including the thoracic duct', 'provenance': [{'wikipedia_id': '67056', 'title': 'Thoracic cavity', 'start_paragraph_id': 10, 'start_character': 12, 'end_paragraph_id': 10, 'end_character': 50, 'bleu_score': 1.0, 'section': 'Section::::Structure.\n'}]}, {'answer': 'structures of the digestive system , including the esophagus'}, {'answer': 'structures of the nervous system including the paired vagus nerves , and the paired sympathetic chains'}, {'answer': 'endocrine glands , including the thymus gland'}, {'answer': 'structures of the cardiovascular system , including the heart and great vessels , which include the thoracic aorta , the pulmonary artery and all its branches , the superior and inferior vena cava , the pulmonary veins , and the azygos vein'}, {'answer': 'structures of the respiratory system , including the Diaphragm , trachea , bronchi and lungs'}]