Question: which architectural feature was used in romanesque churches
[{'answer': 'semi-circular arches', 'provenance': [{'wikipedia_id': '52686', 'title': 'Romanesque architecture', 'start_paragraph_id': 1, 'start_character': 86, 'end_paragraph_id': 1, 'end_character': 106, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '52686', 'title': 'Romanesque architecture', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 605, 'bleu_score': 0.8348588517041531, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 5412555727750900900}, 'section': 'Section::::Abstract.'}]}]