Question: what organs are in the middle of the chest
[{'answer': 'heart', 'provenance': [{'wikipedia_id': '262601', 'title': 'Thorax', 'start_paragraph_id': 1, 'start_character': 219, 'end_paragraph_id': 1, 'end_character': 224, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'lungs', 'provenance': [{'wikipedia_id': '262601', 'title': 'Thorax', 'start_paragraph_id': 1, 'start_character': 226, 'end_paragraph_id': 1, 'end_character': 231, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'thymus gland', 'provenance': [{'wikipedia_id': '262601', 'title': 'Thorax', 'start_paragraph_id': 1, 'start_character': 237, 'end_paragraph_id': 1, 'end_character': 249, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '262601', 'title': 'Thorax', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 483, 'bleu_score': 0.91400636688224, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 7309244928536459772}, 'section': 'Section::::Abstract.'}]}]