Question: who wrote the poetry on which carmina burana is based
[{'answer': 'students and clergy', 'provenance': [{'wikipedia_id': '72566', 'title': 'Carmina Burana', 'start_paragraph_id': 2, 'start_character': 21, 'end_paragraph_id': 2, 'end_character': 40, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '72566', 'title': 'Carmina Burana', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 442, 'bleu_score': 0.8796225591685191, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 12567123285713249294}, 'section': 'Section::::Abstract.'}]}]