Question: when did stained glass windows start in churches
[{'answer': '675 AD', 'provenance': [{'wikipedia_id': '142340', 'title': 'Stained glass', 'start_paragraph_id': 63, 'start_character': 155, 'end_paragraph_id': 63, 'end_character': 161, 'bleu_score': 1.0, 'section': 'Section::::History.:Origins.\n'}]}, {'provenance': [{'wikipedia_id': '142340', 'title': 'Stained glass', 'start_paragraph_id': 63, 'start_character': 0, 'end_paragraph_id': 63, 'end_character': 425, 'bleu_score': 0.972782728923768, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 12809838748813201785}, 'section': 'Section::::History.:Origins.\n'}]}]