Question: when does closure of the ductus arteriosus occur
[{'answer': 'birth', 'provenance': [{'wikipedia_id': '712723', 'title': 'Ductus arteriosus', 'start_paragraph_id': 1, 'start_character': 303, 'end_paragraph_id': 1, 'end_character': 308, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'at birth', 'provenance': [{'wikipedia_id': '712723', 'title': 'Ductus arteriosus', 'start_paragraph_id': 1, 'start_character': 300, 'end_paragraph_id': 1, 'end_character': 308, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '712723', 'title': 'Ductus arteriosus', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 346, 'bleu_score': 0.6616182377799831, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 3660887827734547710}, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '712723', 'title': 'Ductus arteriosus', 'section': 'Section::::Abstract.', 'start_paragraph_id': 1, 'end_paragraph_id': 1, 'meta': {'evidence_span': ["The ductus arteriosus, also called the ductus Botalli, is a blood vessel in the developing fetus connecting the trunk of the pulmonary artery to the proximal descending aorta. It allows most of the blood from the right ventricle to bypass the fetus's fluid-filled non-functioning lungs. Upon closure at birth, it becomes the ligamentum arteriosum.", "It allows most of the blood from the right ventricle to bypass the fetus's fluid-filled non-functioning lungs. Upon closure at birth, it becomes the ligamentum arteriosum", "The ductus arteriosus, also called the ductus Botalli, is a blood vessel in the developing fetus connecting the trunk of the pulmonary artery to the proximal descending aorta. It allows most of the blood from the right ventricle to bypass the fetus's fluid-filled non-functioning lungs. Upon closure at birth, it becomes the ligamentum arteriosum.\rhighlight sentence(s) containing evidence, not only the answer"]}}]}]