Question: what connects the pulmonary trunk to the aorta during fetal circulation
[{'answer': 'ductus arteriosus', 'provenance': [{'wikipedia_id': '3046797', 'title': 'Fetal circulation', 'start_paragraph_id': 6, 'start_character': 287, 'end_paragraph_id': 6, 'end_character': 304, 'bleu_score': 1.0, 'section': 'Section::::Structure.\n'}]}, {'provenance': [{'wikipedia_id': '3046797', 'title': 'Fetal circulation', 'start_paragraph_id': 6, 'start_character': 0, 'end_paragraph_id': 6, 'end_character': 459, 'bleu_score': 0.9748377259086851, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 15569408647476600909}, 'section': 'Section::::Structure.\n'}]}]