Question: gestational sac but no yolk sac and embryo
[{'answer': 'blighted ovum or anembryonic gestation', 'provenance': [{'wikipedia_id': '1166414', 'title': 'Blighted ovum', 'start_paragraph_id': 2, 'start_character': 2, 'end_paragraph_id': 2, 'end_character': 40, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '1166414', 'title': 'Blighted ovum', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 836, 'bleu_score': 0.88423799672098, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 456918154017273781}, 'section': 'Section::::Abstract.'}]}]